AMC V8 engine
Encyclopedia
American Motors Corporation
American Motors
American Motors Corporation was an American automobile company formed by the 1954 merger of Nash-Kelvinator Corporation and Hudson Motor Car Company. At the time, it was the largest corporate merger in U.S. history.George W...

 (AMC) produced a series of widely-used 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 from the mid-1950s before being absorbed into Chrysler
Chrysler
Chrysler Group LLC is a multinational automaker headquartered in Auburn Hills, Michigan, USA. Chrysler was first organized as the Chrysler Corporation in 1925....

 in 1987. Chrysler kept the AMC V8 in production until 1991 for the Jeep Grand Wagoneer
Jeep Wagoneer
The Jeep Wagoneer was an early sport utility vehicle and the first luxury 4x4, produced under varying marques from 1963 to 1991. It was noteworthy for being in production for more than 28 years with only minor mechanical changes...

.

GEN-1 Nash/Hudson/Rambler V8s (1956-1966)

This engine family is now referred to as the "GEN-1" AMC V8, but in its time it was known as the Rambler V8. As part of a larger plan of merging Packard
Packard
Packard was an American luxury-type automobile marque built by the Packard Motor Car Company of Detroit, Michigan, and later by the Studebaker-Packard Corporation of South Bend, Indiana...

, Nash
Nash Motors
Also see: Kelvinator and American Motors CorporationNash Motors was an automobile manufacturer based in Kenosha, Wisconsin, in the United States from 1916 to 1938. From 1938 to 1954, Nash was the automotive division of the Nash-Kelvinator Corporation...

, Hudson
Hudson Motor Car Company
The Hudson Motor Car Company made Hudson and other brand automobiles in Detroit, Michigan, from 1909 to 1954. In 1954, Hudson merged with Nash-Kelvinator Corporation to form American Motors. The Hudson name was continued through the 1957 model year, after which it was dropped.- Company strategy...

, and Studebaker
Studebaker
Studebaker Corporation was a United States wagon and automobile manufacturer based in South Bend, Indiana. Founded in 1852 and incorporated in 1868 under the name of the Studebaker Brothers Manufacturing Company, the company was originally a producer of wagons for farmers, miners, and the...

, AMC President George W. Mason
George W. Mason
George Walter Mason was an American industrialist. During his career Mason served as the Chairman and CEO of the Kelvinator Corporation , Chairman and CEO of the Nash-Kelvinator Corporation , and Chairman and CEO of American Motors Corporation .- Early life :George W. Mason was born in Valley...

 had a verbal agreement with Packard
Packard
Packard was an American luxury-type automobile marque built by the Packard Motor Car Company of Detroit, Michigan, and later by the Studebaker-Packard Corporation of South Bend, Indiana...

 that the two companies would supply parts for each other when practical. AMC started buying Packard V8s in 1954 for the big 1955 Nash Ambassador
Nash Ambassador
Ambassador was the model name applied to the senior line of Nash automobiles from 1932 until 1957. From 1958 until the end of the 1974 model year, the Ambassador was the product of American Motors Corporation , which continued to use the Ambassador model name on its top-of-the-line models...

 and Hudson Hornet
Hudson Hornet
The Hudson Hornet is an automobile that was produced by the Hudson Motor Car Company of Detroit, Michigan between 1951 and 1954. The Hornet was also built by American Motors Corporation in Kenosha, Wisconsin and marketed under the Hudson brand between 1955 and 1957.The first-generation Hudson...

. These were supplied with Packard "Ultramatic" automatic transmissions - exclusively. Packard sent AMC some parts bids, but were rejected as too expensive. George W. Romney
George W. Romney
George Wilcken Romney was an American businessman and Republican Party politician. He was chairman and CEO of American Motors Corporation from 1954 to 1962, the 43rd Governor of Michigan from 1963 to 1969, and the United States Secretary of Housing and Urban Development from 1969 to 1973...

, AMC's new head decided against further relationships with Packard.

Romney ordered his engineering department to develop an in-house V8 as soon as possible. The engineering department hired David Potter, a former Kaiser Motors
Kaiser Motors
Kaiser Motors Corporation made automobiles at Willow Run, Michigan, United States, from 1945 to 1953. In 1953, Kaiser merged with Willys-Overland to form Willys Motors Incorporated, moving its production operations to the Willys plant at Toledo, Ohio...

 engineer, to come in and help develop the engine. Potter had previously worked on a V8 design for Kaiser, and had the experience necessary to take the engine from drawing board to full production in just under 18 months, an extraordinary engineering feat at the time—slide rule
Slide rule
The slide rule, also known colloquially as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for functions such as roots, logarithms and trigonometry, but is not normally used for addition or subtraction.Slide rules come in a...

s were the norm because there were no computers.

All these engines share common external dimensions, weight - about 601 lb (272.6 kg) - forged crankshaft and rods, as well as most other parts. The stroke for all GEN-1 V8 is 3.25  inches. Engine 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...

 The 250 cu in (4.1 l) has a 3.50-inch bore, 287 cu in (4.7 l) 3.75-inch, and the 327 cu in (5.4 l) a 4.0-inch bore. Bore size is cast on the top of the block near the back of the right bank cylinder head. This is difficult to see with the engine installed in a Rambler due to the close proximity of the heater. It can be done with a small inspection mirror. Like most V8 engine designs of the 1950s, the block features a deep skirt where the casting extends below the crankshaft centerline, forming a very rigid crankcase gallery. The oiling scheme is similar to the Chevrolet Small-Block engine
Chevrolet Small-Block engine
The Chevrolet small-block engine is a series of automobile V8 engines built by the Chevrolet Division of General Motors using the same basic small engine block...

 for feeding oil to the cam and crankshaft first, then to the lifter galleries.

250

AMC's first V8, the 250, was used in American Motors Corporation
American Motors
American Motors Corporation was an American automobile company formed by the 1954 merger of Nash-Kelvinator Corporation and Hudson Motor Car Company. At the time, it was the largest corporate merger in U.S. history.George W...

 automobiles from 1956 through 1961. It was a modern (for the time) OHV
Overhead valve
An overhead valve engine, also informally called pushrod engine or I-head engine, is a type of piston engine that places the camshaft within the cylinder block , and uses pushrods or rods to actuate rocker arms above the cylinder...

/pushrod engine
Overhead valve
An overhead valve engine, also informally called pushrod engine or I-head engine, is a type of piston engine that places the camshaft within the cylinder block , and uses pushrods or rods to actuate rocker arms above the cylinder...

 design and made its debut in the Nash Ambassador and Hudson Hornet "Specials" of 1956. These cars had the top of the line model trim, but were built on the shorter wheelbase (Statesman and Wasp) models (hence the "Special" name). The 250 used solid lifters and came in two- and four-barrel carburetor varieties (4V only in Nash/Hudson "Specials").

The 250 V8 was optional in the 1957 Rambler. All 1958-60 V8 Ramblers were called "Rebel" and designated as a different series. However, it is easy to confuse the 1957 Rambler V8 and the 1958-60 Rebel line with the special 1957 Rambler Rebel
Rambler Rebel
The Rambler Rebel is an automobile that was produced by the American Motors Corporation of Kenosha, Wisconsin for the 1957–1960 model years, as well as again for 1966 and 1967.- History :...

, a limited edition muscle car (see 327 below). In 1961, The Rambler Six was renamed the Rambler Classic
Rambler Classic
The Rambler Classic was an intermediate sized automobile that was built and sold by American Motors Corporation from model year 1961 to 1966...

 to avoid model confusion in the Rambler line-up. A V8 engine then became an option in the Classic instead of a separate model.

287

In mid-model year 1963, AMC introduced a 287 CID V8. When the 250 was dropped in 1961, there was no V8 option for Rambler models other than the top of the line Ambassador, which was only available with the 327. Dealers complained, so the 287 was introduced as an option for the "mid-size" Rambler. Like the 327, it used hydraulic valve lifters. Only 2-barrel models were produced, there were no 4-barrel options from the factory for the 287 as this was the economy model V8. The 287 was produced through 1966.

327

The AMC 327 was similar to the 287, but displaced 327 CID due to the bore increase to 4 inches (101.6 mm). Unlike the 250, the 327 came with hydraulic valve lifters.

The AMC 327 engine debuted in a special edition Rambler Rebel
Rambler Rebel
The Rambler Rebel is an automobile that was produced by the American Motors Corporation of Kenosha, Wisconsin for the 1957–1960 model years, as well as again for 1966 and 1967.- History :...

 of which only 1,500 were made. They were an early American "muscle car
Muscle car
Muscle car is a term used to refer to a variety of high-performance automobiles. The Merriam-Webster dictionary defines muscle cars as "any of a group of American-made 2-door sports coupes with powerful engines designed for high-performance driving." Usually, a large V8 engine is fitted in a...

". All Rebels had silver paint with a gold-anodized "spear" on each side. The 327 was not available in any other Rambler models in 1957 other than the Special Edition Rebel.

The legacy Nash Ambassador and Hudson Hornet "Special" models were dropped after 1956, replaced by standard "Rambler" wheelbase models with the 327 V8 instead of the 250 V8. When the big Nash and Hudson cars were dropped after 1957, they were replaced by the 1958 "Ambassador by Rambler"—a stretched Rebel (Rambler V8) with the 327 V8 instead of the 250 engine. The 327 was exclusive to the Ambassador line and could not be ordered in a Rebel or Classic through 1964. For 1965 and 1966 the 287 and 327 were both available in the Classic or Ambassador.

The 327, in two barrel form only, was sold to Kaiser-Jeep from 1965 to 1967 for use in the Jeep Wagoneer
Jeep Wagoneer
The Jeep Wagoneer was an early sport utility vehicle and the first luxury 4x4, produced under varying marques from 1963 to 1991. It was noteworthy for being in production for more than 28 years with only minor mechanical changes...

 SUV and Gladiator pick-up truck. Jeep named it the "Vigilante" V8. Kaiser-Jeep switched to the Buick 350 in 1967 after AMC discontinued the 327. The Buick V8 engine option continued through 1971 after which Jeeps returned to AMC V8 engines, American Motors having purchased Jeep from Kaiser in 1970.

There was a low- and high-compression version of the 327 starting in 1960. Prior to 1960 all 327s were high compression. All low compression models used a 2-barrel carburetor and all high-compression models received a 4-barrel carb. "Low" compression was 8.7:1, high 9.7:1, effected by cast combustion chamber volume.

Electronic fuel injection

The AMC 327 was to be the first commercial electronic fuel injected
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....

 (EFI) Electrojector production engine. Press reports about the Bendix
Bendix Corporation
The Bendix Corporation was an American manufacturing and engineering company which during various times in its 60 year existence made brake systems, aeronautical hydraulics, avionics, aircraft and automobile fuel control systems, radios, televisions and computers, and which licensed its name for...

 developed system in December 1956 were followed in March 1957 by an AMC price bulletin offering the EFI option on the Rambler Rebel for US$
United States dollar
The United States dollar , also referred to as the American dollar, is the official currency of the United States of America. It is divided into 100 smaller units called cents or pennies....

395, but due to supplier difficulties, fuel-injected Rebels would only be available after June 15. Teething problems with the Electrojector unit meant that only a few engineering and press cars were built, estimated to be no more than six units. At least two pre-production
Pre-production car
Pre-production cars are vehicles that allow the automaker to find problems before a new model goes on sale to the public. Pre-production cars come after prototypes, or development mules which themselves are preceded by concept cars...

 Rebels with EFI, however, are known to have been built. One was sent to Daytona Beach, Florida
Daytona Beach, Florida
Daytona Beach is a city in Volusia County, Florida, USA. According to 2008 U.S. Census Bureau estimates, the city has a population of 64,211. Daytona Beach is a principal city of the Deltona – Daytona Beach – Ormond Beach, Florida Metropolitan Statistical Area, which the census bureau estimated had...

 for "Speed Week" (the forerunner of today's Daytona 500
Daytona 500
The Daytona 500 is a -long NASCAR Sprint Cup Series race held annually at the Daytona International Speedway in Daytona Beach, Florida. It is one of four restrictor plate races on the Cup schedule....

). It was the second fastest car on the beach, bested only by a 1957 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...

 with mechanical fuel injection, and only by a couple tenths of a second.

The EFI 327 was rated at 288 hp and the regular 4-barrel carbureted model at 255 hp. The EFI system in the Rebel was a far more-advanced setup than the mechanical types then appearing on the market and the engines ran fine in warm weather, but suffered hard starting in cooler temperatures. All the EFI cars were reportedly converted to 4-barrel carb before being sold; none are known to have existed outside the engineering department at AMC. The main problem was that vacuum tube and early transistor electronics just could not keep up with the demands of "on the fly" engine controls. Ironically, Bendix licensed patents based on the 1957 the design (patent dated 1960) to Bosch
Robert Bosch GmbH
Robert Bosch GmbH is a multinational engineering and electronics company headquartered in Gerlingen, near Stuttgart, Germany. It is the world's largest supplier of automotive components...

, who perfected it as the basis for their D-Jetronic injections system, first used in 1967.

GEN-2 AMC Short-Deck V8 (1966–1970)

The new-generation AMC V8 was first introduced in 1966. It is sometimes referred to as the "GEN-2" AMC V-8. All three engine sizes (290 CID, 343 CID, and 390 CID) share the same basic block design—the different displacements
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...

 are achieved through various bore and stroke combinations. All blocks share the same external measurements and thus can be swapped easily.

Bore center measurement was kept the same as the GEN-1 V-8 (4.75 in.) so that boring equipment could be reused. Other than that, this engine is vastly different from the GEN-1 model. The GEN-1 engine is physically the size of a big-block Ford or GM engine, and is sometimes called a "big-block". The GEN-2 is closer to the physical size of U. S. made small-block V8s except for the bore centers, which are the same as some big-block engines. There are no shared parts between the AMC GEN-1 and GEN-2/3 engines.

Contrary to a popular myth, the AMC V8 was not built by Ford
Ford Motor Company
Ford Motor Company is an American multinational automaker based in Dearborn, Michigan, a suburb of Detroit. The automaker was founded by Henry Ford and incorporated on June 16, 1903. In addition to the Ford and Lincoln brands, Ford also owns a small stake in Mazda in Japan and Aston Martin in the UK...

 or anyone else although it bears an uncanny resemblance to the later Buick V8 engines (400, 430, 455). It shares the same design employing a timing gear case that mounts both distributor and oil pump. It also shares the same oiling scheme employing a single passage to feed both cam and crank from the right lifter bank by tangentially intersecting the cam bore instead of two drilled passages, one from the cam to crank and another from the crank to the right lifter bank. Some electrical parts (starter and distributor) were shared with Fords, and some models used Motorcraft (Ford) carburetors, but the balance of the engine design is unique.

The GEN-2 AMC V-8 was first introduced at 290 CID in 1966. It was used exclusively in the American model the first year. The 343 CID came out in 1967 and the AMX 390 CID (6.4 L) arrived in 1968. These engine blocks were unchanged through the 1969 model year.

The head used during this time are the so-called rectangle port, named after their exhaust port shape. The 290 heads use smaller valves, 1.787 in (45.4 mm) intake and 1.406 in (35.7  mm) exhaust, in order to prevent problems with the small bore. The 343 and AMX 390 used the same larger valve heads, 2.025 in (51.4 mm) intake and 1.625 in (41.3 mm) exhaust.

290

The base 290 CID 290 produced 200 to 225 hp (149 to 168 kW) with a 2-barrel and 4-barrel carburetor, respectively. It was built from the mid-1966 model year through the 1969 model year. It has a 3.75-inch bore (95.25 mm) and 3.28-inch (83.31 mm) stroke. Only 623 cars were built in 1966 with the 290. These should all be "American" models, but it has been rumored that a few "Classic" models may have received 290s as inventory of 287s ran low. This is unlikely, as some 287 engines would have been kept in inventory for warranty replacements.

343

The 343 CID 343 has a 4.08 in (103.6 mm) bore and 3.28 in (83.31 mm) stroke. The basic 343/2V produced 235 hp and was built from 1967 through 1969. Output for the optional 4-barrel carburetor version was 290 hp and 365 ft·lbf (495 N·m) gross. This version had a 10.2:1 compression ratio.

AMX 390

In addition to the largest bore and stroke, the 390 CID AMX 390 motor also got heavier main bearing support webbing and a forged steel crankshaft and connecting rods. Forged cranks and rods were used for known strength—there was inadequate time for testing cast parts for durability without slipping AMCs desired introduction schedule. Once forging dies were made it wasn't cost effective to test cast parts due to the relatively low number of engines produced. This was continued with the 401. The bonus was that the big AMC engines, when used in performance applications, never had problems with rods breaking, unlike other US companies' large displacement small block engines. The GEN-2 AMX 390 produced 315 hp and was built in 1968 and 1969. Bore is 4.165 in (105.791 mm) and stroke is 3.68 in (93.47 mm). Maximum factory recommended overbore is only 0.020 in, though they are commonly bored 0.030 in. In 1970, AMC changed the head design to the later known "dog-leg" exhaust port.

GEN-3 AMC Tall-deck (1970-1991)

In 1970, all three blocks grew in deck height and gained a new head design. These changes made this the third generation of AMC V-8, hence it is sometimes referred to as the GEN-3 AMC V-8. The stroke and deck height on the 290 and 343 was increased by 0.16 in (~5/32 in), becoming the 304 CID and 360 CID, respectively. The 1970 AMX 390 remained at the same displacement by using a special rod and piston for this year only. It is believed that AMC kept the 390 this last year due to the reputation it had garnered in the two seater AMX, which was discontinued after 1970. In 1971 the 390 was stroked by 0.16 in to become the 401.

The other change in 1970 was the switch to the dog-leg heads. These heads flow ~20% better on the exhaust side than the 1966-69 rectangle port heads and are thus the best for performance. There are two reasons for the flow increase: First, the area of the port is larger, due to the dog leg. Second, the shape of the port floor was changed from a concave to a convex curve. The concave floor tended to bend the exhaust flow upwards which caused turbulence when the flow was forced to go down into the exhaust manifolds. By switching to a convex floor the curvature of the flow starts in the head and proceeds much more smoothly into the exhaust manifold resulting in less turbulence and better flow.

The center two intake bolts on each head were relocated to prevent accidental mix-ups of GEN-2 and GEN-3 intakes. The intakes can be interchanged by slotting the bolt holes, but the added deck height of the GEN-3 engine means that sealing and port match will be compromised. GEN-3 intakes can be machined to fit GEN-2 engines by surface grinding the intake flanges (by a machine shop) and slotting the center holes.

There is a persistent myth about 1970-mid 1971 "319" or "291" AMC heads. These heads have the dog-leg exhaust ports and 50-52 cc combustion chambers. They are commonly identified by the first three (319) or last three (291 for the 360-401 heads; 304 used a different casting) digits of the casting number. There was a U.S. auto industry-wide shift to lower compression ratios in mid 1971, so AMC increased combustion chamber size to 58-59 cc. The first three digits of the casting number on the large chamber heads are 321, 322, or 323 depending on year. The only difference between small and large chamber GEN-3 heads is the combustion chamber size. The early heads are not "the best" AMC heads as many have come to believe. They will raise compression on a later engine with no other changes, but if building an engine get the proper pistons for the desired ratio. There is no reason to search out these relatively hard to find, and more expensive when found, heads for performance.

304

The 304 had a displacement of 303.92 CID (4,980.3 cc) which produced 210 hp in 1970-71 and was built starting in 1970. Later models produced less power from the factory, going down yearly. 1972-78 models were rated at 150 hp. It was rated at 130 hp in 1979, the last year it was installed in passenger cars, and 125 hp in 1980-81, the last years it was used in Jeep vehicles.

360

The AMC 360 had a displacement of 359.80 CID (5,896.1  cc). The 2-barrel produced 235 hp to 245 hp in 1970 to early 71 while the 4-barrel produced 285 hp to 295 hp, 175 hp to 220 hp from mid-1971 to 1975, 140 hp to 180 hp in 1976, 129 hp in 1977, and 160 hp from 1978 to 1991.

It was the last AMC V8 to be manufactured. It was used exclusively in Jeep J-series Trucks 1970-1987, Jeep Wagoneer models from 1972–84, Cherokee from 1974 to 1983, and Grand Wagoneer from 1984 to 1991 - becoming the last carbureted engine used in an American-built vehicle. It was also installed in the Bricklin SV-1
Bricklin SV-1
The Bricklin SV-1 was a gull-wing door sports car assembled in Saint John, New Brunswick, Canada. The body panels were manufactured in a separate plant in Minto, New Brunswick. Manufactured from 1974 until early 1976 for the U.S. market, the car was the creation of Malcolm Bricklin, an American...

 car in 1974 only.

390

The AMC 390 CID 390 produced 325 hp in all except the Rebel Machine
AMC Rebel
The AMC Rebel is a mid-size car produced by American Motors Corporation from 1967 to 1970. It replaced the Rambler Classic. The Rebel was replaced by the similar AMC Matador for the 1971 model year...

. This muscle car
Muscle car
Muscle car is a term used to refer to a variety of high-performance automobiles. The Merriam-Webster dictionary defines muscle cars as "any of a group of American-made 2-door sports coupes with powerful engines designed for high-performance driving." Usually, a large V8 engine is fitted in a...

 engine was rated at 340 hp due to a different intake. Production only lasted one year (1970) before it was stroked to become the 401 CID. Like its GEN-2 cousin, the maximum factory recommended overbore is only 0.020 in, though they are commonly bored 0.030 in.

401

The 401 had a displacement of 401.11 CID (6,572.9  cc) which produced 330 hp gross in 1971 and 255 hp net from 1972 to 1975. In 1976 it was rated at 215 hp. Like the 390, the 401's crankshaft and connecting rods are forged steel. Like the 390, factory recommended overbore is only 0.020 in, commonly bored to 0.030 in. It was last produced in 1979. Their combination of rarity, toughness, and excellent power output, 401 engines are highly sought after.

The 401 was available in the Javelin, Matador, and Ambassador car lines and in Jeeps from its introduction in 1971 through 1974. In 1975 and 1976, emission controls, insurance rates, and high gasoline prices meant the 401 was available on the large Matador model, and then only for police department orders. Buyers of full-sized Jeeps (Wagoneer, Cherokee, J-10 and J-20) could order a 401 until 1979. This engine was also supplied to International Harvester for use as an optional engine in International's full size pickup trucks and Travelalls from late 1973 through 1974.

"Service replacement" blocks

There was also a "Service Replacement" block made as a modified GEN-3 design. This is a 401 casting (same casting number) without the displacement cast into the side and with a 360 bore and thicker deck. In theory this single block could be built as any 343-401 GEN-2 or GEN-3 engine. A dealer could stock one or two blocks to use for warranty replacement.

The main bearing web area was thicker in the 390, 401 and SR blocks, thick enough that two additional bearing cap bolt holes could be drilled and tapped for an aftermarket four bolt main cap, providing a stronger bottom end. AMC never built a factory four bolt main block, they sold aftermarket four bolt main caps through their Group 19 performance parts program.

The SR block also sold as a heavy duty racing block, which is speculated to be the real reason it was produced in the first place. It appeared in 1970 in time for the 1971 Trans-Am racing season, and was used in the factory Trans-Am backed cars prepared by TRACO for Penske Racing, with Mark Donohue the primary driver. Since it was a standard factory part it did not have to be homologated under T/A rules, and was not used in the 2501 "Mark Donohue" Javelins built to homologate the "duck tail" spoiler. Those received standard 360 or 390 engines, buyers choice. The only thing special about the Donohue Javelins were the spoiler and "Mark Donohue" signature decals. That makes it an easy model to clone, and tough on AMC hobbyists.

AMC V8 engine summary

AMC V8 hp/torque, compression & bore/stroke by year
Note: from 1972 and up the hp/torque figures are net rating
YearModelPower
hp
Horsepower
Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...

 (kW)
Torque
ft·lbf
Torque
Torque, moment or moment of force , is the tendency of a force to rotate an object about an axis, fulcrum, or pivot. Just as a force is a push or a pull, a torque can be thought of as a twist....

 (N·m
Newton metre
A newton metre is a unit of torque in the SI system. The symbolic form is N m or N·m, and sometimes hyphenated newton-metre...

)
Comp.
ratio
Compression ratio
The 'compression ratio' of an internal-combustion engine or external combustion engine is a value that represents the ratio of the volume of its combustion chamber from its largest capacity to its smallest capacity...

Bore
in (mm)
Stroke
in (mm)
1966 287-2B 198 (148)@ 4700 280 @ 2600 8.7:1 3.75 3.250
327-2B 250 (186)@ 4700 340 @ 2600 8.7:1 4.000 3.250
327-4B 270 (201)@ 4700 360 @ 2600 9.7:1 4.000 3.250
1967 290-2B 200 (149)@4700 285 (386)@2800 8.7:1 3.75 (95.3) 3.28 (83.3)
290-4B 225 (168)@4800 300 (406)@3200 10.0:1 3.75 (95.3) 3.28 (83.3)
343-2B 235 (175)@4400 345 (467)@2600 8.7:1 4.08 (103.6) 3.28 (83.3)
343-4B 280 (209)@4800 365 (494)@3000 10.2:1 4.08 (103.6) 3.28 (83.3)
1968 290-2B 200 (149)@4600 285 (386)@2800 9.0:1 3.75 (95.3) 3.28 (83.3)
290-4B 225 (168)@4700 300 (406)@3200 10.0:1 3.75 (95.3) 3.28 (83.3)
343-2B 235 (175)@4400 345 (467)@2600 9.0:1 4.08 (103.6) 3.28 (83.3)
343-4B 280 (209)@4800 365 (494)@3000 10.2:1 4.08 (103.6) 3.28 (83.3)
390-4B 315 (235)@4600 425 (576)@3200 10.2:1 4.165 (105.8) 3.574 (90.8)
1969 290-2B 200 (149)@4600 285 (386)@2800 9.0:1 3.75 (95.3) 3.28 (83.3)
290-4B 225 (168)@4700 300 (406)@3200 10.0:1 3.75 (95.3) 3.28 (83.3)
343-2B 235 (175)@4400 345 (467)@2600 9.0:1 4.08 (103.6) 3.28 (83.3)
343-4B 280 (209)@4800 365 (494)@3000 10.2:1 4.08 (103.6) 3.28 (83.3)
390-4B 315 (235)@4600 425 (576)@3200 10.2:1 4.165 (105.8) 3.574 (90.8)
390-4B (SS/AMX) 340 (254)@4800 430 (583)@3400 12.2:1 4.165 (105.8) 3.574 (90.8)
1970 304-2B 210 (157)@4400 305 (413)@2800 9.0:1 3.75 (95.3) 3.44 (87.4)
360-2B 245 (183)@4400 365 (494)@2600 8.5:1 4.08 (103.6) 3.44 (87.4)
360-4B (Early) 290 (216)@4800 390 (528)@3000 10.2:1 4.08 (103.6) 3.44 (87.4)
360-4B (Late) 295 (220)@4800 395 (535)@3000 10.5:1 4.08 (103.6) 3.44 (87.4)
390-4B 325 (250)@5000 420 (569)@3200 10.2:1 4.165 (105.8) 3.574 (90.8)
390-4B (Machine) 340 (254)@5000 427 (579)@3600 10.2:1 4.165 (105.8) 3.574 (90.8)
1971 304-2B 210 (157)@4400 300 (406)@2600 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 245 (183)@4400 365 (494)@2600 8.5:1 4.08 (103.6) 3.44 (87.4)
360-4B (Early) 295 (220)@4800 395 (535)@3000 10.5:1 4.08 (103.6) 3.44 (87.4)
360-4B (Late) 285 (213)@4800 385 (522)@3000 9.5:1 4.08 (103.6) 3.44 (87.4)
401-4B (Early) 335 (250)@5000 435 (589)@3400 10.2:1 4.165 (105.8) 3.68 (93.5)
401-4B (Late) 330 (246)@5000 430 (583)@3400 9.5:1 4.165 (105.8) 3.68 (93.5)
1972 304-2B 150 (112)@4200 245 (332)@2500 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 170 (127)@4000 285 (386)@2400 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 195 (145)@4400 295 (400)@2900 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B (Dual Ex) 220 (164)@4400 315 (427)@3100 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 235 (175)@4600 8.25:1 4.165 (105.8) 3.68 (93.5)
401-4B (Dual Ex) 255 (190)@4600 345 (467)@3300 8.25:1 4.165 (105.8) 3.68 (93.5)
1973 304-2B 150 (112)@4200 245 (332)@2500 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 170 (127)@4000 285 (386)@2400 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 195 (145)@4400 295 (400)@2900 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B (Dual Ex) 220 (164)@4400 315 (427)@3100 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 235 (175)@4600 8.25:1 4.165 (105.8) 3.68 (93.5)
401-4B (Dual Ex) 255 (190)@4600 345 (467)@3300 8.25:1 4.165 (105.8) 3.68 (93.5)
1974 304-2B 150 (112)@4200 245 (332)@2500 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 170 (127)@4000 285 (386)@2400 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 195 (145)@4400 295 (400)@2900 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B (Dual Ex) 220 (164)@4400 315 (427)@3100 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 235 (175)@4600 8.25:1 4.165 (105.8) 3.68 (93.5)
401-4B (Dual Ex) 255 (190)@4600 345 (467)@3300 8.25:1 4.165 (105.8) 3.68 (93.5)
1975 304-2B 150 (112)@4200 245 (332)@2500 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 175 (130)@4000 285 (386)@2400 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 195 (145)@4400 295 (400)@2900 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B (Dual Ex) 220 (164)@4400 315 (427)@3100 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 255 (190)@4600 345 (467)@3300 8.25:1 4.165 (105.8) 3.68 (93.5)
1976 304-2B 120 (89)@3200 220 (298)@2200 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 140 (104)@4000 260 (352)@2400 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 180 (134)@4400 280 (379)@2800 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 215 (160)@4200 320 (433)@2800 8.25:1 4.165 (105.8) 3.68 (93.5)
1977 304-2B 121 (90)@3450 219 (296)@2000 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 129 (96)@3700 245 (332)@1600 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 170(172PS)@3500 280@2800 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 195(198PS)@3500 305@2800 8.25:1 4.165 (105.8) 3.68 (93.5)
1978 304-2B 130 (97)@3200 238 (322)@2000 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 140 (104)@3350 278 (376)@2000 8.25:1 4.08 (103.6) 3.44 (87.4)
360-4B 8.25:1 4.08 (103.6) 3.44 (87.4)
401-4B 8.25:1 4.165 (105.8) 3.68 (93.5)
1979 304-2B 125 (93)@3200 220 (298)@2400 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 245 (182)@4400 365 (494)@2600 8.5:1 4.08 (103.6) 3.44 (87.4)
360-4B 4.08 (103.6) 3.44 (87.4)
401-4B 4.165 (105.8) 3.68 (93.5)
1980 304-2B 125 (93)@3200 220 (298)@2400 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 4.08 (103.6) 3.44 (87.4)
360-4B 4.08 (103.6) 3.44 (87.4)
1981 304-2B 125 (93)@3200 220 (298)@2400 8.4:1 3.75 (95.3) 3.44 (87.4)
360-2B 4.08 (103.6) 3.44 (87.4)
360-4B 4.08 (103.6) 3.44 (87.4)
1982 360-2B 4.08 (103.6) 3.44 (87.4)
360-4B 4.08 (103.6) 3.44 (87.4)
1991 360-2B 4.08 (103.6) 3.44 (87.4)
360-4B 4.08 (103.6) 3.44 (87.4)

See also

  • AMC Straight-4 engine
    AMC Straight-4 engine
    The American Motors Corporation straight-4 engine was used by a number of AMC, Jeep, and Dodge vehicles from 1984-2002.*For an outline of all engines used by AMC see -Development:...

  • AMC Straight-6 engine
    AMC Straight-6 engine
    The American Motors Corporation straight-6 family of engines was used by a number of AMC and Jeep vehicles from 1964 through 2006.-195.6:American Motors' first straight-six engine was the...

  • AMC/Jeep Transmissions
  • List of Chrysler engines
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