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Chevrolet Small-Block engine

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Just bought a "350" so i was told here are the numbers that came off the block off the back of the block 855909 B2 78 T7 00NV2 off the front of...

Hi my dad and i just bought a 64 impala with a suposed rebuilt small block chevy. Its definatley a small block and there is a tag on the left side of...

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Encyclopedia

Chevrolet Small-Block V8 engine
Manufacturer:	General Motors
Production:	1955–2003
Successors:	GM LT engine GM LT engine The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine... , GM LS engine GM LS engine The GM LS engine family is an engine design intended as the only V-8 engine used in General Motors' line of rear-wheel-drive cars and trucks. The LS series was a "clean sheet" design with little in common with the classic Chevrolet small block V8...
Type:	small-block V8
265
Production:	1955–1957
Displacement:	265 cu in (4.3 l)
Power:	162 hp-240 hp
Bore and Stroke:	3.75 by 3 in (95.3 by 76.2 mm)
283
Production:	1957–1967
Displacement:	283 cu in (4.6 l)
Power:	195 hp-315 hp
Bore and Stroke:	3.875 by 3 in (98.4 by 76.2 mm)
327
Production:	1962–1969
Displacement:	327 cu in (5.4 l)
Power:	235 hp-375 hp
Bore and Stroke:	4 by 3.25 in (101.6 by 82.6 mm)
350
Production:	1967–2003
Displacement:	350 cu in (5.7 l)
Power:	145 hp-370 hp
Bore and Stroke:	4 by 3.48 in (101.6 by 88.4 mm)
302
Production:	1967–1969
Displacement:	302 cu in (5 l)
Power:	290 hp
Bore and Stroke:	4 by 3 in (101.6 by 76.2 mm)
307
Production:	1968–1973
Displacement:	307 cu in (5 l)
Power:	115 hp-200 hp
Bore and Stroke:	3.875 by 3.25 in (98.4 by 82.6 mm)
400
Production:	1970–1981
Displacement:	400 cu in (6.6 l)
Power:	150 hp-265 hp
Bore and Stroke:	4.125 by 3.75 in (104.8 by 95.3 mm)
262
Production:	1975–1976
Displacement:	262 cu in (4.3 l)
Power:	110 hp
Bore and Stroke:	3.67 by 3.1 in (93.2 by 78.7 mm)
305
Production:	1976–2000
Displacement:	305 cu in (5 l)
Power:	130 hp-250 hp
Bore and Stroke:	3.736 by 3.48 in (94.9 by 88.4 mm)

The Chevrolet small-block engine is a series of automobile V8 engine

V8 engine

A V8 engine is a V engine with eight cylinders mounted on the crankcase in two banks of four cylinders, in most cases set at a right angle to each other but sometimes at a narrower angle, with all eight pistons driving a common crankshaft....

s built by the Chevrolet

Chevrolet

Chevrolet , also known as Chevy , is a brand of vehicle produced by General Motors Company . Founded by Louis Chevrolet and ousted GM founder William C. Durant on November 3, 1911, General Motors acquired Chevrolet in 1918...

Division of General Motors

General Motors

General Motors Company , commonly known as GM, formerly incorporated as General Motors Corporation, is an American multinational automotive corporation headquartered in Detroit, Michigan and the world's second-largest automaker in 2010...

using the same basic small (for a V8) engine block

Cylinder block

A cylinder block is an integrated structure comprising the cylinder of a reciprocating engine and often some or all of their associated surrounding structures...

. Retroactively referred to as the "Generation I" small-block, it is distinct from subsequent "Generation II" LT

GM LT engine

The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine...

and "Generation III" LS

GM LS engine

The GM LS engine family is an engine design intended as the only V-8 engine used in General Motors' line of rear-wheel-drive cars and trucks. The LS series was a "clean sheet" design with little in common with the classic Chevrolet small block V8...

engines.

Production of the original small-block began in 1955 with a displacement

Engine displacement

Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top dead centre to bottom dead centre . It is commonly specified in cubic centimeters , litres , or cubic inches...

of 265 cu in (4.3 l), growing incrementally over time until reaching 400 cu in (6.6 l) in 1970. Several intermediate displacements appeared over the years, such as the 283 cu in (4.6 l) that was available with mechanical fuel injection

Fuel injection

Fuel injection is a system for admitting fuel into an internal combustion engine. It has become the primary fuel delivery system used in automotive petrol engines, having almost completely replaced carburetors in the late 1980s....

, the 327 cu in (5.4 l) (5.3L), as well as the numerous 350 cu in (5.7 l) versions. Introduced as a performance engine in 1967, the 350 went on to be employed in both high- and low-output variants across the entire Chevrolet product line.

Although all four of Chevrolet's siblings of the period (Buick

Buick V8 engine

Like its sister General Motors divisions, Buick produced its own family of V8 engines to replace its straight-8 engines. These engines came in many of the same displacements as those from other divisions, but were entirely different.-Buick "Nailhead V8":...

, Cadillac

Cadillac V8 engine

Cadillac was the first automobile maker to mass produce a V8 engine. The company has produced eight generations of V8s since 1914, and was the last General Motors division to retain its own V8 design.-L-Head:...

, Oldsmobile

Oldsmobile V8 engine

The Oldsmobile Rocket V8 was the first post-war OHV V8 at General Motors. Production started in 1949, with a new generation introduced in 1964. Like Pontiac, Olds continued building its own V8 engine family for decades, finally adopting the corporate Chevrolet 350 small-block and Cadillac Northstar...

, and Pontiac

Pontiac V8 engine

Pontiac began as a adjunct to the Oakland division of the General Motors line of automobiles in 1926. Pontiac successfully competed against more expensive 4-cylinder models with their inline flathead 6 engines. After outselling Oakland, Pontiac became the sole survivor of the two by 1932. In...

) designed their own V8s, it was the Chevrolet 350 cu in (5.7 l) small-block that became the GM corporate standard. Over the years, every American General Motors division except Saturn used it and its descendants in their vehicles.

Finally superseded by GM's Generation II LT

GM LT engine

The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine...

and Generation III LS

GM LS engine

V8s in the 1990s and discontinued in 2003, the engine is still made by a GM subsidiary in Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

as an aftermarket

Aftermarket (automotive)

The automotive aftermarket is the secondary market of the automotive industry, concerned with the manufacturing, remanufacturing, distribution, retailing, and installation of all vehicle parts, chemicals, tools, equipment and accessories for light and heavy vehicles, after the sale of the...

replacement. In all, over 90,000,000 small-blocks have been built in carbureted

Carburetor

A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....

and fuel injected forms since 1955.

The small-block family line was honored as one of the 10 Best Engines of the 20th Century by automotive magazine Ward's AutoWorld.

The Chevrolet 90-Degree V6 engine

Chevrolet 90-Degree V6 engine

The Chevrolet 90° V6 family of engines began in 1978 with the Chevrolet 200 cid V6 as the base engine for the all new 1978 Chevrolet Malibu. This engine family is still produced today, as the 4.3 L V6 engine used in Chevrolet and GMC trucks and vans.These engines have a 90° vee block...

, which is still in production, is this original small-block (and NOT the newer LS1) but minus cylinders #3 and #6

Confusion with LT and LS engines

The original Chevrolet-designed small-block is a specific family of engines manufactured originally in 1955 and installed as production powerplants by GM for 48 years.

Subsequent GM small block V-8 engine designs built on different blocks are often confused with the original small-block.

For more information on the Generation II small-block V8s, which differ mainly in their reverse-flow cooling system, see the GM LT engine
GM LT engine
The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine...

.

For more information on the current family of Chevy Generation III/IV General Motors small-block V8s see the GM LS engine
GM LS engine
The GM LS engine family is an engine design intended as the only V-8 engine used in General Motors' line of rear-wheel-drive cars and trucks. The LS series was a "clean sheet" design with little in common with the classic Chevrolet small block V8...

.

Overview

The first generation of Chevrolet small-blocks began with the 1955 Chevrolet 265 cu in (4.3 l) V8 offered in the Corvette

Chevrolet Corvette

The Chevrolet Corvette is a sports car by the Chevrolet division of General Motors that has been produced in six generations. The first model, a convertible, was designed by Harley Earl and introduced at the GM Motorama in 1953 as a concept show car. Myron Scott is credited for naming the car after...

and Bel Air

Chevrolet Bel Air

The Chevrolet Bel Air is a full-size automobile that was produced by the Chevrolet division of General Motors for the 1950–1975 model years. Hardtops in the Chevrolet Deluxe Styleline model range were designated with the Bel Air name from 1950–1952, but it was not a distinct series of its own until...

. Soon after being introduced, it quickly gained popularity among stock car racers, becoming known as the "Mighty Mouse

Mighty Mouse

Mighty Mouse is an animated superhero mouse character created by the Terrytoons studio for 20th Century Fox.-History:The character was created by story man Izzy Klein as a super-powered housefly named Superfly. Studio head Paul Terry changed the character into a cartoon mouse instead...

" motor, after the popular cartoon character of the time, with the simpler "Mouse" nickname becoming much more popular as time went on.

By 1957 it had grown to 283 cu in (4.6 l). Fitted with the optional Rochester

Rochester Products Division

Rochester Products Division was a division of General Motors that manufactured carburetors, and related components including emissions control devices and cruise control systems in Rochester, New York...

mechanical fuel injection, it became one of the first production engine ever to make one horsepower per cubic inch. The 283 would later be extended to other Chevrolet models, replacing the old style 265 V8s.

A high-performance 327 cu in (5.4 l) variant followed, turning out as much as 375 hp and increasing horsepower per cubic inch to 1.15.

It was, however, the 350 cu in (5.7 l) series that came to be the best known Chevrolet small block. The engine's oversquare 4.00-inch bore and 3.48-inch stroke (102 mm by 88 mm) are nearly identical to the 436 hp LS3 engine of today, but much has changed. Installed in everything from station wagons to sports cars, in commercial vehicles, and even in boats and (in highly modified form) airplanes, it is by far the most widely used small-block of all-time.

Though not offered in GM vehicles since 2004, the 350 cu in (5.7 L) series is still in production today at General Motors' Toluca, Mexico plant under the company's "Mr Goodwrench" brand, and is also manufactured as an industrial and marine engine by GM Powertrain under the Vortec name.

From 1955–74, the small-block engine was known as the "Turbo-Fire V8".

Small Block Chevrolet V8 (1955–1998)

The small-block made its debut in 1955 and remained popular for over five decades for its relatively compact size, light weight, and extensive aftermarket support. The engines have been placed into families with the name of each family being the bore size of that family’s progenitor.

3.750/3.875 in. bore family (1955–1973)

The engine family from which all Chevy V8s from the big blocks to today's LS7 and LS9 evolved is the 265/283 small block family. Of the three engines in this family, two of them, the 265 and the 283, have gone down in automotive history. The first of this family was the 265 in 1955. The 283, famous for being one of the first engines to make 1 hp per cubic inch is also famous for being the evolutionary stepping stone that would give rise to later small blocks and to the “W” blocks which would later give rise to the Chevy big blocks. The last of this family was the 307 which was a stroked 283 with a medium journal.

265

The 265 cu in (4.3 l) V8 was the first Chevrolet small block. Designed by Ed Cole

Ed Cole

Edward Nicholas Cole was an American automotive executive for General Motors.- Career :Cole was the son of a dairy farmer. In his youth, he designed, built, and sold homemade radio sets, and as a teenager became a field representative for a tractor manufacturer...

's group at Chevrolet

Chevrolet

to provide a more powerful engine for the 1955 Corvette

Chevrolet Corvette

than the model's original "stove bolt" in-line six, the 165 hp 2-barrel debut version went from drawings to production in just 15 weeks.

A pushrod cast-iron engine with hydraulic lifter

Lifter

Lifter can mean:* Ionocraft, a device that can generate thrust using ionised air with no moving parts* Tappet, part of an internal combustion engine that actuates a poppet valve through rocker arms and pushrods...

s, the small block was available with an optional 4-barrel Rochester carburetor

Carburetor

A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....

, increasing engine output to 195 hp. The oversquare (3.75 in (95 mm) bore, 3 in (76 mm) stroke) engine's 4.4 in (111.8 mm) bore spacing would continue in use for decades.

Also available in the Bel Air sedan, the basic passenger car version produced 162 hp with a 2-barrel carburetor. Upgraded to a four-barrel Rochester, dual exhaust "Power Pack" version, the engine was conservatively rated at 180 hp.

A shortcoming of the 1955 265 was that the engine had no provision for oil filtration built into the block, instead relying on an add-on filter mounted on the thermostat housing. In spite of its novel green sand foundry construction, the '55 block's lack of adequate oil filtration leaves it typically only desirable to period collectors.

The 1956 Corvette introduced three versions of this engine – 210 hp with a single 4-barrel carb, 225 hp with twin 4-barrels, and 240 hp with twin fours and a high-lift cam.

283

The 265 ci V-8 was bored out to 3.875 in (98.4 mm) in 1957, giving it a 4638 cc displacement. The first 283 motors used the stock 265 blocks. However, the overbore to these blocks resulted in thin cylinder walls. Future 283 blocks were recast to accept the 3.875 bore. Five different versions between 185 hp and 283 hp were available, depending on whether a single carb, twin carbs, or fuel injection was used. Fuel injection yielded the most power. Horse power was up a bit each year for 1958, 1959, and 1960. The 1957 Ramjet mechanical fuel injection

Fuel injection

version produced an even 1 hp per cubic inch (61 hp/L), an impressive feat at the time. Many thought this as the first US-built production V8 to produce one horsepower per cubic inch. However, it was preceded in this achievement by Chrysler in 1956.

Besides being available in the Chevrolet line, it was optional in Checker Taxi

Checker Taxi

Checker Taxi was an American taxi company. It used the Checker Taxi Cab produced by the Checker Motors Corporation of Kalamazoo, Michigan. Both Checker Taxi and its parent company Checker Motors Corporation were owned by Morris Markin....

s beginning in 1965.
A version of it that was built by GM Canada was also available in Studebakers produced in Canada for 1965 & 1966.

307

A 5025 cc version was produced from 1968 through 1973. Engine bore was 3.875 inches (98.4 mm) with a 3.25 inches (82.6 mm) stroke.

The 307—essentially a 283 block with the longer-stroke 327 crankshaft—replaced the 283 in Chevrolet cars in 1968, and produced 225 hp (149 kW) SAE gross at 4,600 rpm and 300 lbft of torque at 2,400 rpm. This engine was an option in 1968 only Checker Marathon

Checker Marathon

The Checker Marathon was an automobile produced by the Checker Motors Company of Kalamazoo, Michigan, between 1961 and 1982.Marathons were produced in both four-door sedan and four-door station wagon forms, and the rare eight-door, 12-seater "Aerobus" wagon....

s. Later versions produced as little as 115 hp (86 kW) SAE net. Chevrolet did not produce a high-performance version of the engine, but did produce, for Outboard Marine Corporation, a high-performance marinized 307, rated at 235 hp and 245 hp SAE gross, depending on year, that shipped with the Corvette/Z-28's cast aluminum valve covers and Rochester QuadraJet carb. Chevy also built other versions of the OMC 307 rated at 210 hp, 215 hp and 225 hp SAE gross.

4.00 in bore family (1962–1998)

Originally intended as the performance block, this engine family through the 350 CID became an all purpose engine that saw use in many applications from Corvettes to vans. All engines in this family share the same block dimensions and sometimes even the same casting number; the latter meaning engines were of the same block, but with different strokes (e.g. the casting number 3970010 was used by all three engines: 302, 327, and 350). This engine family was updated in 1968 for the use of 2.45” medium-sized journals. The first engine in this family was the small journal 327 in 1962 and the last being 1992's medium journal 350. The medium journal 350 would later be further developed into the "Generation II" LT

GM LT engine

The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine...

350 in the early 1990s.

302

Chevrolet produced a special 302 cu in (4.9 L) (referred to as 5.0 L) engine for Sports Car Club of America

Sports Car Club of America

The Sports Car Club of America is a club and sanctioning body supporting road racing, rallying, and autocross in the United States. Formed in 1944, it runs many programs for both amateur and professional racers.-History:...

SCCA Trans-Am Series

Trans-Am Series

The Trans-Am Series is an automobile racing series which was created in 1966 by Sports Car Club of America President John Bishop. Originally known as the Trans-American Sedan Championship it has evolved over time from its original format as a manufacturers championship for modified racing sedans...

racing from 1967–1969. It was the product of placing the 283 3-inch stroke crankshaft into a 4-inch bore 327 block. The 1967 302 used the same nodular cast-iron crank as the 283[4], with a forged-steel crankshaft that was also produced. This block is one of 3 displacements, 302/327/350, that underwent a crankshaft bearing diameter transformation for 1968 when the rod-journal size was increased from the 2.00 in. diameter small-journal to a 2.10 large-journal and the main-journal size was increased from 2.30 in. to 2.45. The large-journal connecting rods were heavier and used 3/8 in. diameter cap-bolts to replace the small-journal’s 11/32. 1968 blocks were made in 2-bolt and 4-bolt versions with the 4-bolt center-three main caps each fastened by two additional bolts which were supported by the addition of heavier crankcase main-web bulkheads. When the journal size increased to the standard large-journal size, the crankshaft for the 302 was specially built of tufftride-hardened forged 1053-steel and fitted with a high-rpm 8.00 in. diameter harmonic balancer. This engine was used only in the first-generation (1967-69) Z/28 Camaro. It had a 3/4-length semi-circular windage tray, heat-treated, magnafluxed, and shot-peened forged 1038-steel 'pink' connecting rods, floating-pin in `69, and forged-aluminum pistons with higher scuff-resistance, better sealing single-moly rings. Its solid-lifter cam, known as the '30-30 Duntov' named after its .030/.030 in. intake/exhaust hot valve-lash and Zora Arkus-Duntov

Zora Arkus-Duntov

Zora Arkus-Duntov was a Belgian-born American engineer. His work on the Chevrolet Corvette earned him the nickname "Father of the Corvette."- Early life :Zora was born Zachary Arkus in Belgium on Christmas Day, 1909...

the "father of the Corvette", was also used in the 1964-65 carbureted 327/365 and F.I. 327/375 engines. It used the '202' 2.02/1.60 valve diameter high-performance 327 double-hump #461 heads, hardened 'blue-stripe' pushrods, edge-orifice lifters to keep more valvetrain oil in the crankcase for high-rpm lubrication, and stiffer valvesprings. In 1967, a new design high-rise cast-aluminum dual-plane intake manifold with larger runners and smoother passage turns was introduced for the Z/28 that the LT-1 350 1969 Corvette and 1970 Z/28 were equipped with until 1973. Unlike the Corvette, the exhaust manifolds were the more restrictive rear outlet 'log' design to clear the Camaro's front cross-member. It had a chrome oil filler tube and valve covers from 1967 to 1968, and chrome 14.00 x 3.00 in. drop-base open-element air-cleaner assembly on a 780cfm vacuum secondary Holley

Holley

-People:* Alexander Lyman Holley, mechanical engineer* Charles Hardin Holley was the real name of singer Buddy Holly* George Holley , England international footballer...

4-Bbl carburetor. A 'divorced' exhaust crossover port heated well-choke thermostat coil was used to provide cleaner and faster engine warm-up. Its single-point distributor had an ignition point cam designed to reduce point-bounce at high-rpm along with a vacuum diaphragm to advance ignition timing at idle and part-throttle for economy and emissions. Balancer and water-pump pulleys, as well as optional power-steering's pulley, were deep-groove for belt retention at high-rpm. In 1969, the 302 shared the cast-aluminum valve covers with the LT-1 350 Corvette engine. Conservatively rated at 290 hp (216 kW) (SAE gross) at 5800 rpm and 290 lb-ft at 4800, actual output with its production 11:1 compression ratio was around 376 hp (280 kW) with tubular headers that came in the trunk when ordered with a new Z/28, carburetor main-jet, and ignition timing tuning.

After the 1967 Trans-Am campaign with the 4-Bbl induction system producing more horsepower than the competing auto makers' 8-Bbl systems, for 1968 Chevrolet developed a factory 'cross-ram' aluminum intake-manifold package using two Holley 585cfm mechanical-secondary carburetors for Trans-Am racing. It was available only as off-road service parts purchased over the Chevrolet dealership parts counter. With the Chevrolet '140' off-road cam, the package increased a stock 302's hp from 360 hp to approximately 400. Chevrolet went so far as to carry the positive crankcase ventilation (PCV) system over to the cross-ram induction system to retain emissions compliance mandated for U.S.-produced cars beginning in 1967, that also provided full-throttle crankcase pressure venting to the intake air to burn its vapors. Engines prepared for competition use were capable of producing 465 hp with little more than the 8-Bbl induction, ported heads with higher pressure valvesprings, roller rocker arms, and the '754' road-race cam. 1967/1968 models' cowl-induction system had an enclosed air-cleaner assembly ducted from its passenger side into the firewall cowl above the heater core. In 1969, factory ZL-2 cowl-induction hoods were available for both the single and dual four-barrel induction systems that were sealed to the air-cleaner base ensuring cooler, high-pressure, dense air from the center of the base of the windshield was supplied to the engine for combustion smoothness and maximum power production. Another popular service-parts-only component used on the 302 was the Delco transistor-ignition distributor, introduced in 1967 and also used in the L88 427 Corvette, that eliminated the production breaker-point ignition allowing more stable ignition-timing at high engine speeds.

The 302's bore/stroke and rod/stroke geometries made it a natural high-rpm engine and were responsible for its being among the more reliable production street engines homologated for full-competition across all the American makes winning back-to-back Trans-Am Championships at the hands of Mark Donohue

Mark Donohue

Mark Neary Donohue, Jr. , nicknamed "Captain Nice", was an American racecar driver known for his ability to set up his own race car as well as driving it to victories. Donohue is probably best known as the driver of the 1500+ bhp “Can-Am Killer” Porsche 917-30 and as the winner of the 1972...

in 1968 and 1969. However, the pinnacle of the 302's use in professional racing was its being the primary engine that powered the outstanding but overshadowed 1967-1976 SCCA Formula 5000

Formula 5000

Formula 5000 was an open wheel, single seater auto-racing formula that ran in different series in various regions around the world from 1968 to 1982. It was originally intended as a low-cost series aimed at open-wheel racing cars that no longer fit into any particular formula...

Championship Series, a SCCA Formula A open-wheel class designed for lower cost. Weighing 1400 lbs., with 525-550 hp, a 5-spd. transaxle, and 20 in. wide 15 in. rear wheels, it produced incredibly exciting racing. Prepared with a Lucas-McKay mechanically-timed fuel-injection, individual-stack magnesium induction-system that was paired with ported production double-hump iron heads and a virtually stock production crankshaft, it had a lasting impact on the series' ability to conduct high car-number finishes and close competition events by the degree of mechanical success it provided to a series filled with star international Grand Prix

Formula One

Formula One, also known as Formula 1 or F1 and referred to officially as the FIA Formula One World Championship, is the highest class of single seater auto racing sanctioned by the Fédération Internationale de l'Automobile . The "formula" designation in the name refers to a set of rules with which...

drivers like, David Hobbs

David Hobbs

David Wishart Hobbs is a British former racing driver currently employed as a commentator for Speed Channel. In 1969 Hobbs was included in the F.I.A...

, Brian Redman

Brian Redman

Brian Herman Thomas Redman is a British racing driver from England....

, Jody Scheckter

Jody Scheckter

Jody David Scheckter is a South African former auto racing driver, the Formula One World Drivers Champion.-Career:Scheckter was born in East London, South Africa and educated at Selborne College.-Formula One:...

, and Mario Andretti

Mario Andretti

Mario Gabriele Andretti is a retired Italian American world champion racing driver, one of the most successful Americans in the history of the sport. He is one of only two drivers to win races in Formula One, IndyCar, World Sportscar Championship and NASCAR...

327

The 5354 cc V8, introduced in 1962, had a bore of 4 in (101.6 mm) and a stroke of 3.25 in (82.55 mm). Power ranged from 210 hp L30 to 375 hp depending on the choice of carburetor or fuel injection, camshaft, cylinder heads, pistons and intake manifold. In 1962, the Duntov solid lifter cam versions produced 340 hp, 344 lbft with single Carter 4-barrel, and 360 hp, 352 lbft with Rochester mechanical fuel injection. In 1964, horsepower increased to 365 hp for the now dubbed L-79 version, and 375 hp for the fuel injected L-84 respectively, making the L-84 the most powerful naturally aspirated, single-cam, production small block V8 (aside from the limited-run Ford Boss 351) until the appearance of the 385 hp, 385 lbft Generation III LS6

LS6

LS6 or LS-6 may refer to:* Rolladen-Schneider LS6, glider * GM 2500 engine LS6, straight-4 engine * GM LS engine LS6, V8 engine * Chevrolet Big-Block engine LS-6 , V8 engine...

in 2001. This block is one of three displacements that underwent a major change in 1968/1969 when the main journal size was increased from 2.3 inches (58.4 mm) to 2.45 inches (62.2 mm).

In 1966, Checker began offering the 327 as an option.

350

The 350 first appeared as a high-performance 295 hp L-48 option for the 1967 Chevrolet Camaro

Chevrolet Camaro

The Chevrolet Camaro is an automobile manufactured by General Motors under the Chevrolet brand, classified as a pony car and some versions also as a muscle car. It went on sale on September 29, 1966, for the 1967 model year and was designed as a competing model to the Ford Mustang...

. One year later it was made available in the Chevrolet Nova

Chevrolet Nova

The Chevrolet Chevy II/Nova is a compact automobile manufactured by the Chevrolet division of General Motors produced in four generations for the 1962 through 1979 model years. Nova was the top model in the Chevy II lineup through 1968. The Chevy II nameplate was dropped, Nova becoming the...

, and finally in 1969 the rest of the Chevrolet line could be ordered with a 350. Many variants followed:

L-48

Years: 1967–1980

The L-48 is the original 350 cu in (5.7 l), available only in the Camaro (1967-up) or Chevy II/Nova in '68-79. In '69 it was used in almost all car lines; Camaros, Impalas, El Caminos, Chevelles & Novas. 1969 L-48's use a Hyd Cam, 4bbl Quadrajet carburetor, cast pistons, 4-bolt main

4-Bolt Mains

A 4 bolt main refers to the number of bolts attaching the main bearing caps to the block of an internal combustion engine. Four bolt mains are considered much stronger for high performance use than a 2 bolt main...

#010 Blocks & #041 or 186 heads. Power output was 300HP and 380 lbft torque. Compression ratio was 10.25-1.
In 1972 the only way to get a L-48 (4bbl V8) in a Chevy Nova was to get the Super Sport Package. This is indicated by the 5th digit in the VIN being a "K". 1972 was the only year you could verify the Super Sport package by the VIN.

The L-48 V8 was the standard engine in the 1975–1980 Chevrolet Corvette

Chevrolet Corvette

. The L-48 V8 Corvette engine produced 165 bhp in 1975. Power increased to 180 bhp in 1976 and stayed the same in 1977. 1978 saw 175 bhp for California or high altitude areas and 185 bhp for everywhere else. Power increased to 195 bhp in 1979 and decreased to 190 bhp in 1980.

Years: 1970-1974
The ZQ3 was the standard engine in the 1970–1974 Chevrolet Corvette

Chevrolet Corvette

. It was a 300 bhp version of the 350 cu in small-block, with 10.25:1 compression and hydraulic lifters. It used a Rochester "4MV" Quadra-Jet 4-barrel carburetor. This was the first block produced that featured the larger 2.45 inch main bearing versus the older 2.30 inch main bearing in 1968/1969.

note* post 1971 blocks had a lower nickel content but thicker cylinder deck, and post 1974 heads of the small block chevy used less iron in them and are lighter weight, and less powerful because of the lower compression ratios used.

In 1971, power decreased to 270(gross)bhp and 300(gross)lb-ft of torque with 8.5:1 compression. 1972 saw 200(net)bhp and 270(net)lb-ft of torque. In 1973 power decreased to 190 bhp, but increased slightly in 1974 to 195 bhp.

Years: 1969
The L46 was an optional engine for the 1969 Chevrolet Corvette

Chevrolet Corvette

. It was a higher performance version of the base 350 cu in V8 with #492 LT-1 "2.02" 2.02/1.60 valve heads and had a 11:1 compression ratio and produced 350 bhp.

LT-1

Years: 1970–1972

The LT-1 was the ultimate 350 cu in V8, becoming available in 1970. It used solid lifters, 11:1 compression, the '178' high-performance camshaft, and a 780 CFM Holley four-barrel carburetor on a special aluminum intake, with rams' horn exhaust manifolds in the Chevrolet Corvette

Chevrolet Corvette

, Delco transistor ignition and a low-restriction exhaust to produce a factory rated 370 bhp at 6000 rpm and 380 lb-ft at 4000 (the NHRA rated it at 425 hp for classification purposes). Redline was 6500 rpm but power fell off significantly past 6200 rpm. The LT-1 was available in the Corvette

Chevrolet Corvette

, Corvette ZR-1, and Camaro Z28

Chevrolet Camaro

. Power was down in 1971 to 330 bhp and 360 lb-ft of torque with 9:1 compression, and again in 1972 (the last year of the LT-1, now rated using net, rather than gross, measurement) to 255 bhp and 280 lb-ft.

The "LT1" designation was later reused on a Generation II GM engine, the LT1.

Years: 1973–1980

The 1973–1974 L82 was a "performance" version of the 350 that still used the #624 76cc chamber LT-1 "2.02" heads but with a Rochester Quadra-jet 4-Bbl carburetor and dual-plane aluminum intake manifold, an updated version of the 350hp 327 hydraulic-lifter cam, and 9:1 compression forged-aluminum pistons producing 250 bhp (`73 was the first year for SAE net hp rating, as installed in the vehicle with accessories and mufflers) and 285 lb-ft of torque. Its cast-aluminum LT-1 valvecovers were painted crinkle-black contrasting with the aluminum manifold and distributor housing. It was down to 205 bhp and 255 lb-ft of torque for 1975. It produced 210 bhp in the Corvette for 1976-1977. The 1978 L82 recovered somewhat, producing 220bhp and 260lb-ft in the Corvette and in 1979 it produced 225 bhp in the Corvette. In 1980, its final year, it produced a peak of 230 bhp. This engine was also available on the Chevrolet Camaro.

Years: 1981

The L81 was the only 350 cu in (5.7 l) Corvette engine for 1981. It produced 190 bhp and 280 lb-ft of torque from 8.2:1 compression, exactly the same as the 1980 L48, but added computer control spark advance, replacing the vacuum advance

Years: 1982, 1984

The 1982 L83 was again the only Corvette engine (and only available with an automatic transmission) producing 200 bhp and 285 lb-ft of torque from 9:1 compression. This was again the only engine on the new 1984 Vette, at 205 bhp and 290 lb-ft of torque. The L83 added Cross-Fire fuel injection

Fuel injection

(twin throttle-body fuel injection). Since GM did not assign a 1983 model year to production Corvettes, there was also no L83 for 1983.

For the new Generation IV V8, see GM L98.

Years: 1985–1992

The new 1985 L98 added tuned-port fuel injection "TPI", which was standard on all 1985–1991 Corvettes. It was rated at 230 bhp for 1985-1986, 240 bhp for 1987-1990 (245 bhp with 3.07:1 rear axle ratio (1988-1990 only)), and 245 bhp in 1991 (250 bhp with 3.07:1 rear axle). Aluminum cylinder heads (Corvette only) were released part way through the 1986 model run and continued through the end of L98 Corvette production in 1991. The L98 V8 was optional on 87–92 Chevrolet Camaro

Chevrolet Camaro

& Pontiac Firebird

Pontiac Firebird

The Pontiac Firebird was built by the Pontiac division of General Motors between 1967 and 2002. The Firebird was introduced the same year as the automaker's platform-sharing model, the Chevrolet Camaro...

models (rated at 225 hp-245 hp and 330 lbft-345 lbft)
1987 versions had 10 hp and 15 lbft more thanks to 9.5:1 compression and a change to hydraulic roller camshaft. Compression was up again in 1991 to 10:1 but output stayed the same.

The LM1 is the base 350 cu in (5.7 l) with a 4-barrel carburetor (usually with a Rochester Quadrajet) in passenger cars until 1988. Throughout its lifespan, it received either a points, electronic, and/or computer-controlled spark system, to conventional and feedback carburetors.

LM1s were superseded with the L05 powerplant after 1988.

The L05 was introduced in 1987 for use in Chevrolet/GMC trucks in both the GMT400 (introduced in April 1987 as 1988 models) and the R/V series trucks such as the K5 Blazer, Suburban, and rounded-era pickups formerly classed as the C/K until 1991 which includes chassis cabs and 4-door crew cabs. Although usage was for trucks, vans, and 9C1-optioned Caprices, the L05 was also used with the following vehicles:

1992/1993 Buick Roadmaster
Buick Roadmaster
The Roadmaster was an automobile built by the Buick division of General Motors. Roadmasters produced between 1936 and 1958 were built on Buick's longest non-limousine wheelbase and shared their basic structure with senior Oldsmobiles. Between 1946 and 1957 the Roadmaster was Buick's top of the line...

sedan and station wagon
1990–1992 Cadillac Brougham
Cadillac Brougham
Originally an enclosed carriage, drawn by a single horse, for 2-4 persons, “Brougham” owes its name to a British statesman, Henry Brougham, 1st Baron Brougham and Vaux, whose second claim to fame is having given to the sea-front drive, in Nice in the South of France, the nick-name of Promenade des...

(optional engine)
1993 Cadillac Fleetwood
Cadillac Fleetwood
Lawrence P. Fisher was the Fisher brother most closely involved with Cadillac in its early years. In 1916 he joined the Fisher Body Company which had been formed by two of his brothers in 1908. Larry was one of four of the seven Fisher brothers who brought Fisher Body Corporation under the General...
1989-1993 Chevrolet Caprice
Chevrolet Caprice
The Chevrolet Caprice is a full-sized automobile produced by the Chevrolet Division of General Motors in North America for the 1965 through 1996 model years. Full-size Chevrolet sales peaked in 1965 with over a million sold. It was the most popular American car in the sixties and early seventies....

1A2-optioned special service station wagon
1992/1993 Chevrolet Caprice
Chevrolet Caprice
The Chevrolet Caprice is a full-sized automobile produced by the Chevrolet Division of General Motors in North America for the 1965 through 1996 model years. Full-size Chevrolet sales peaked in 1965 with over a million sold. It was the most popular American car in the sixties and early seventies....

Wagon (optional engine)
1993 Chevrolet Caprice
Chevrolet Caprice
The Chevrolet Caprice is a full-sized automobile produced by the Chevrolet Division of General Motors in North America for the 1965 through 1996 model years. Full-size Chevrolet sales peaked in 1965 with over a million sold. It was the most popular American car in the sixties and early seventies....

LTZ
1992 Oldsmobile Custom Cruiser
Oldsmobile Custom Cruiser
The Oldsmobile Custom Cruiser is large rear-wheel drive station wagon which was produced by Oldsmobile from 1971 to 1992. The Custom Cruiser used the same platform as the Buick, Chevrolet and Pontiac full-size wagons...

Wagon (optional engine)

L05 usage was replaced by the LT1 after 1993 in GM B-Bodies

GM B platform

The B platform, or B-body, was General Motors' full-size rear-wheel drive automobile platform. It was closely related to the C-body and D-body and was used for coupés, sedans, and station wagons....

until production ceased in 1996.

In mid 1996 the L05 was equipped with Vortec heads used in the 1996 G30.

The L31 replaced the L05 in 1996 – known as the Vortec 5700. The Vortec 5700 produces 255 hp (191 kW) to 350 hp (261 kW) at 4600 rpm and 330 ft-lbf (448 N·m) to 350 ft-lbf (475 N·m) of torque at 2800 rpm. Known as the GEN 1+, this was the final incarnation of the 1955-vintage small block, ending production in 2005 with the last vehicle being a Kodiak/Topkick HD truck. Volvo Penta and Mercury Marine still produces the L31. The "MARINE" intake is a potential upgrade for L31 trucks. Using this "MARINE" intake will allow the use of common types of injectors with various flow rates while still maintaining emission compliance.

Goodwrench

The GM Goodwrench 350 crate engine comes in several variations. The cheapest version produces 195 net horsepower (with accessories), and 260 gross horsepower (without the alternator, power steering, A/C compressor, catalytic converter, factory exhaust manifold, and muffler) when used with a four barrel carburetor, dual exhaust, and headers. The low output is the result of the relatively low 8.5:1 compression ratio, restrictive cylinder heads, dished pistons, and stock camshaft profile.

All of the GM Goodwrench engines use the pre-1986 four-bolt casting molds with two dipstick locations; pre-1980 on the driver's side and post-1980 on the passenger's side. This engine was produced in Mexico since 1981 as the Targetmaster 350, and now the GM Goodwrench 350.

The 350 can be turned into a 383 stroker or a 355. The 383 can be made by purchasing a kit that comes with everything that is needed except machine work. The cylinders should also be bored .030 over. The 383 has a bore of 4.030 and a stroke of 3.75 inches.The 355 can be made by just boring the block .030 over and using the stock 350 crank. The 355 has a bore of 4.030 and a stock stroke of 3.48 inches.

400

The only block of this family, 400 cu in (6.6 l) small-block, was introduced in 1970 and produced for 10 years. It was loosely based on the medium journal 350 and had a 4.125 inches (104.8 mm) bore and a 3.75 inches (95.3 mm) stroke. The 400 differed from other small blocks in that the cylinders were siamesed, used a 2.65” large journal, and oftentimes had one more freeze plug on both the left and right sides of the block. Initial output was 265 hp and was only available equipped with a 2-barrel carburetor. In 1974 a 4-barrel version of the 400 was introduced, while the 2-barrel version stopped production in 1975. 1976 was the last year that the 400 was used in a Chevrolet Passenger car, available in both A-Body

GM A platform

The General Motors A platform was a mid-size car automobile platform. The A-bodies evolved from rear wheel drive compacts, to rear wheel drive mid-size cars, to front wheel drive mid-size cars over the course of 32 years. The switch in drive layout in 1982 spawned the G-body...

and B-Body

GM B platform

The B platform, or B-body, was General Motors' full-size rear-wheel drive automobile platform. It was closely related to the C-body and D-body and was used for coupés, sedans, and station wagons....

lines. While popular with circle-track racers and drag racers, the engine was prone to cooling problems if cylinder heads without steam holes were used.

3.671 in bore family (1975–2003)

Designed and built during the era of the gas embargo and tighter emissions, this engine family was meant as “economy” V8’s. This family through the 305 became an all purpose engine that was intended to have better gas economy than the larger 350 but more power and torque than GM's contemporary line of inline 6 cylinders. During the 80’s when GM was streamlining their engine lineups, the 305 rose to prominence as Chevrolet’s “Corporate” engine, signifying its use in multiple GM brands. Through much of the 80’s the 305 became an alternative to the 350 as the least poorly-performing engine in the F body cars and even made an appearance in the Corvette for one year in 1980. The first engine in this family was the medium journal 262 in 1975, and the last the medium journal 305. The medium journal 305 would later on, like its contemporary 350, in the early 1990s be further developed- although with a reduced stroke- into the "Generation II" LT

GM LT engine

The LT6 and LT7 are not part of the LT V8 family. See Oldsmobile Diesel V6 engine.General Motors' Generation II LT is a small block V8 engine...

L99 263.

262

The 1975–1976 262 was a 262 cu in (4.3 l) 90° pushrod V8 with an iron block and heads. Bore and stroke were 3.67 in (93 mm) by 3.10 in (78.7 mm). Power output for 1975 was 110 hp and 195 lbft at 3600 rpm. The 262 was replaced by the 305 for the 1977 model year.

This was Chevrolet's second 4.3 L-displacement powerplant; three other Chevrolet engines displaced 4.3 L: the Vortec 4300 (a V6 based on the Chevrolet 350, with two cylinders removed), the original 265 V8 in 1955, and a derivative of the GenerationII LT

-Lithuania:* Lithuania* Lithuanian language, ISO 639-1 code for Lithuanian language, and the abbreviation used for the Lithuanian Wikipedia * .lt - the Internet country code top-level domain for Lithuania....

engines known as the L99 (using the 305's 3.736-inch bore, 5.94-inch connecting rods, and a 3-inch crankshaft stroke).

This engine was used in the following cars:

1975–1976 Chevrolet Monza
Chevrolet Monza
The Chevrolet Monza is a subcompact, four-passenger automobile produced by the Chevrolet division of General Motors for the 1975–1980 model years. The Monza is based on the Chevrolet Vega, sharing its wheelbase, width and 140 CID inline-4 engine...
1975 Chevrolet Nova
Chevrolet Nova
The Chevrolet Chevy II/Nova is a compact automobile manufactured by the Chevrolet division of General Motors produced in four generations for the 1962 through 1979 model years. Nova was the top model in the Chevy II lineup through 1968. The Chevy II nameplate was dropped, Nova becoming the...
Early 1977 Pontiac Ventura
Pontiac Ventura
The Pontiac Ventura was an automobile produced by the Pontiac Motor Division of General Motors. The word "ventura" is a derivitave of the word "bonaventure" which is Italian for "good fortune". It also shares its name with the locations of Ventura, California and Ventura, Iowa...

305

The 305 5.0L variant of the small-block Chevrolet which was a 262 that was bored out and stroked using the crank of the 350 was introduced in 1975 had a displacement of 305 cu in (5 l) with a 3.7350-inch (94.869 mm) bore, and 3.4803-inch (88.4 mm) stroke. Many performance enthusiasts shun the 305 because of the wide availability of 350 engines, along with the fact that the same parts will yield much more power in a 350 cubic inch package. Due to the popularity of the 350, items like rebuild kits are more expensive for the 305. The 305 still has power potential due to the broad selection of aftermarket parts that are readily interchangeable with the popular 350. Not all cylinder heads may be adapted to this engine due to valves having bore interference or shrouding issues with the narrow bore of the 305 engine, but there are many LO3 setups that can produce over 300 horsepower from the right combination.

Induction systems for the 305 included carburetors (both 2 and 4-barrel), throttle-body injection (TBI), tuned-port fuel injection (TPI), and sequential fuel injection (GM Vortec).

The 305 was used in the following cars:

1976–1992 Chevrolet Camaro
Chevrolet Camaro
The Chevrolet Camaro is an automobile manufactured by General Motors under the Chevrolet brand, classified as a pony car and some versions also as a muscle car. It went on sale on September 29, 1966, for the 1967 model year and was designed as a competing model to the Ford Mustang...
1980 Chevrolet Corvette
Chevrolet Corvette
The Chevrolet Corvette is a sports car by the Chevrolet division of General Motors that has been produced in six generations. The first model, a convertible, was designed by Harley Earl and introduced at the GM Motorama in 1953 as a concept show car. Myron Scott is credited for naming the car after...

(California only)
1977–1993 Chevrolet Caprice
Chevrolet Caprice
The Chevrolet Caprice is a full-sized automobile produced by the Chevrolet Division of General Motors in North America for the 1965 through 1996 model years. Full-size Chevrolet sales peaked in 1965 with over a million sold. It was the most popular American car in the sixties and early seventies....

(includes Impala)
1977–1986 Pontiac Parisienne
Pontiac Parisienne
The Pontiac Parisienne is a full-size rear-wheel drive vehicle that was sold by Pontiac on the GM B platform in Canada from 1958 to 1986 and in the US from 1983 to 1986...
1976–1979 Chevrolet Monza
Chevrolet Monza
The Chevrolet Monza is a subcompact, four-passenger automobile produced by the Chevrolet division of General Motors for the 1975–1980 model years. The Monza is based on the Chevrolet Vega, sharing its wheelbase, width and 140 CID inline-4 engine...
1976–1979 Chevrolet Nova
Chevrolet Nova
The Chevrolet Chevy II/Nova is a compact automobile manufactured by the Chevrolet division of General Motors produced in four generations for the 1962 through 1979 model years. Nova was the top model in the Chevy II lineup through 1968. The Chevy II nameplate was dropped, Nova becoming the...

(also GM X-body clones after 1976)
1976–1988 Chevrolet Malibu
Chevrolet Malibu
Malibus and all other Chevelles were completely restyled for 1968 with semi-fastback rooflines on two-door hardtops and wheelbases split to on two-door models and 118 for four-door sedans and station wagons. Engine offerings included a new V8 rated at that replaced the V8 that had served as the...

, Chevrolet El Camino
Chevrolet El Camino
The Chevrolet El Camino is a coupe utility vehicle produced by the Chevrolet division of General Motors for the 1959–1960 model years in response to the success of its rival, Ford Ranchero. Production resumed for the 1964–1977 model years based on the Chevelle platform, and continued for the...

, and Chevrolet Monte Carlo
Chevrolet Monte Carlo
The Chevrolet Monte Carlo was an American-made two-door coupe introduced for model year 1970, and manufactured over six generations through model year 2007. It was marketed as a personal-luxury coupe through most of its history, with the last model version being classified as a full-sized coupe...
1978–1992 Pontiac Firebird
Pontiac Firebird
The Pontiac Firebird was built by the Pontiac division of General Motors between 1967 and 2002. The Firebird was introduced the same year as the automaker's platform-sharing model, the Chevrolet Camaro...
1978–1980 Oldsmobile Cutlass
Oldsmobile Cutlass
The Oldsmobile Cutlass is a line of automobiles made by the Oldsmobile division of General Motors. The Cutlass began as a unibody compact car, but saw its greatest success as a body-on-frame intermediate car....

(US Market only, Canadian market 1978–1987)
1991–1992 Oldsmobile Custom Cruiser
Oldsmobile Custom Cruiser
The Oldsmobile Custom Cruiser is large rear-wheel drive station wagon which was produced by Oldsmobile from 1971 to 1992. The Custom Cruiser used the same platform as the Buick, Chevrolet and Pontiac full-size wagons...
1981–1987 Pontiac Grand Prix
Pontiac Grand Prix
Picking up where the Pontiac Ventura model left off, the Grand Prix first appeared in the Pontiac line for 1962. It was essentially a standard Pontiac Catalina coupe with minimal outside chrome trim and a sportier interior...
1975–1979 Buick Skylark
Buick Skylark
The Buick Skylark was a passenger car produced by the Buick division of General Motors. The model was made in six production runs. In each run, the car design varied dramatically due to changing technology and tastes, as well as new standards implemented over the years.-1953–1954:Introduced to mark...
1977–2003 Chevrolet/GMC Trucks, SUVs, Vans
1991–1992 Cadillac Brougham
Cadillac Brougham
Originally an enclosed carriage, drawn by a single horse, for 2-4 persons, “Brougham” owes its name to a British statesman, Henry Brougham, 1st Baron Brougham and Vaux, whose second claim to fame is having given to the sea-front drive, in Nice in the South of France, the nick-name of Promenade des...
1978–1987 Buick Regal
Buick Regal
The Buick Regal is a mid-size car introduced by General Motors for the 1973 model year. North American production ended in 2004 and began again in 2011. For the 2011 model year, Buick re-introduced the Regal to the North American market, positioned as an upscale sport sedan...

After 1996, its usage was limited to light trucks and SUVs until the 2000 model year (vans and commercial vehicles until 2003) as the Vortec 5000. Currently still in production as a marine powerplant for Mercury Marine.

Year	hp (kW)	lb•ft (N•m)
1976	140	250	w/2bbl.
1977	145	245	w/2bbl.
1978	140	240	w/2bbl.
1978	160	235	w/4bbl.
1979	130	245	w/2bbl.
1979†	125	235	w/2bbl.
1980	155	240	w/4bbl.
1981	150	240	w/4bbl

† California Emissions

Years:1976–1980

This variant used a Rochester 2GC carburetor for 1976–78. In 1979 the more fuel efficient Dualjet 2-bbl carburetor replaced the older 2GC. This change also resulted in a drop in the horsepower rating to 130 hp (125 for California emissions cars). All years had an 8.5:1 compression ratio.

Years: 1980–1987

The LG4 produced 150 hp-170 hp and 240 lbft-250 lbft. The addition of a knock sensor for the engine management system in 1985 allowed an increase in compression and a more aggressive spark timing map in the ECM. As a result power increased for the 1985 models to 165 hp from the 150 hp rating in 1984.

Years: 1983–1986

The L69 featured a compression ratio of 9.5:1, heads from the LU5 engine and the camshaft from the L83. Additionally the engine came equipped with a dual snorkel air cleaner assembly, aluminum intake manifold, aluminum flywheel and a knock sensor which allowed more aggressive spark timing. This engine produced 190 hp @ 4800 and 240 lbft of torque @ 3200 rpm.

Years: 1981–1986

The LE9 305 cu in (5 l) was a truck/van/car version 4BBL 650CFM that also had a 9.5:1 compression ratio, the LM1 cam and 14010201 casting heads featuring 1.84/1.50" valves and 53 cc chambers. The engine made 210 hp @ 4,000 and 250 lbft @ 2,000 rpm. NOTE, while it is 5.0 liters, the body is a 5.7 liter 350, the difference is in relation to the camshaft with respect to the diameter of their cylinders,and the 4 bolts in 350 vs to 2 in 305,being the last designs carburetor.

Years: 1985–1992

The LB9 was introduced with 215 hp and 275 lbft and varied between 190 hp-230 hp (with 275 lbft-300 lbft of torque) over the years offered.

Years: 1987–95

The LO3 produced 170 hp and 255 lbft of torque; 170 hp at 4,400 rpm and 275 lbft at 2,400 in 1993–1995 GM trucks. This engine used throttle-body fuel injection.

267

The 267 was introduced in 1979 for GM F-Body (Camaro), G-bodies (Chevrolet Monte Carlo, El Camino, and Malibu Classic) and also used on GM B-body cars (Impala and Caprice models). The 4390 cc engine had the 350's crankshaft stroke of 3.48" and the smallest bore of any small-block, 3.500 in (88.9 x 88.4 mm). The 3½ in bore was also used on the 200 cu in (3.3 l) V6, which was introduced a year earlier. (The 200 was a Chevrolet V6 engine based on the small block with the #3 and #6 cylinders removed).

It was available with a Rochester Dualjet 210 – effectively a Rochester Quadrajet with no rear barrels. After 1980, electronic feedback carburetion was used on the 267. The 267 also saw use in 1980 to 1982 Checker Marathon

Checker Marathon

s.

While similar in displacement to the other 4.3–4.4 L V8 engines produced by General Motors (including the Oldsmobile 260 and Pontiac 265, the small bore 267 shared no parts with the other engines and was phased out after the 1982 model year due to inability to conform to emission standards. Chevrolet vehicles eventually used the 305 cu in (5 l) as its base V8 engine.

Major changes

The original design of the small block remained remarkably unchanged for its production run, which began in 1955 and ended, in passenger vehicles, in 2003. The engine is still being built today for many aftermarket applications, both to replace worn-out older engines and also by many builders as high-performance applications. The principal changes to it over the years include:

1956 – Full flow oil filtration was introduced, using a paper element filter in a canister that was mounted to a feature that was added to the cylinder block casting and machined for this purpose.
1957 – The displacement of the base V8 continued at 265 cubic inches but optional V8s were introduced with 283 cubic inch displacement.
1958 – Bosses for side motor mounts were added to the block casting and utilized for production mounts for this and all future model years. However the features for front motor mounts as used in 1955–1957 remained part of the block casting in this and future years. The 265 cubic inch version of the engine was discontinued.
1962 – The block's cylinder wall casting was revised to allow four inch bores and the 327 cubic inch version of the engine using this bore diameter and increased crankshaft stroke was introduced.
1968 – The main journal diameter was increased to 2.45 in (medium) from 2.30 in (small) and the connecting rod journal diameter was increased to 2.10 in from 2.00 in. This allowed the use of cast iron crankshafts as the previous parts were made of forged steel. The rod bolts were changed from 11/32 in. diameter to 3/8 inch. Additionally, the canister/sock style oil filter was now converted to use spin on filters. The oil fill location was moved from a tube on the front of the intake manifold to a cap on either side valve cover.
1986 – The rear main seal was changed from a 2-piece rubber design to a 1-piece rubber design that used a mounting appliance to hold it in place. This necessitated a change in the flywheel/flexplate bolt pattern, as well as the need for an externally balanced flexplate/flywheel.
1987 – The valve cover surfaces were changed such that cylinder head mounting lip was raised and the bolt location was moved from 4 bolts on the perimeter, to 4 bolts down the centerline of the valve cover (this design debuted on the Corvette in 1986, and Chevrolet 4.3 L the year before). Also changed were the mounting angles of the center 2 bolts on each side of the intake manifold (from 90 degrees to 73 degrees) and the lifter bosses were increased in height to accept roller lifters. The alloy heads for use in the Corvette still retain the non-angled bolts (center 2 bolts attaching to the intake). Also all carburetors were done away with and replaced by TBI (throttle-body injection) fuel injection on the Camaro & Firebird.
1996 – This was the last change for the Generation I engine, and continued through the end of the production run in 2003; all 1997–2003 Generation I engines were Vortec truck engines. The cylinder heads were redesigned using improved ports and combustion chambers similar to those in the Generation II LT1, resulting in significant power increases. The intake manifold bolt pattern was also changed to four bolts per cylinder head instead of the traditional six.

Chevrolet Small-Block engine

Confusion with LT and LS engines

Overview

Small Block Chevrolet V8 (1955–1998)

3.750/3.875 in. bore family (1955–1973)

265

283

307

4.00 in bore family (1962–1998)

302

327

350

400

3.671 in bore family (1975–2003)

262

305

267

Major changes

See also