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GMC V6 engine
 
 
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GMC Truck produced a unique 60° V6 engine from 1960 through 1978. The engine was available in 305, 351, 401 and 478-cubic-inch (5.0, 5.8, 6.6, and 7.8 L) versions. In late production there was also a version with enlarged crankshaft journals. GMC also made a 60° V8 with twin balance shaft
Balance shaft

In piston engine engineering, a balance shaft is an Eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced ....
s using the same general layout as the 305. Finally, there was a "Twin Six" V12, which was basically two 351s placed end-to-end with a common block and crank.






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GMC Truck produced a unique 60° V6 engine from 1960 through 1978. The engine was available in 305, 351, 401 and 478-cubic-inch (5.0, 5.8, 6.6, and 7.8 L) versions. In late production there was also a version with enlarged crankshaft journals. GMC also made a 60° V8 with twin balance shaft
Balance shaft

In piston engine engineering, a balance shaft is an Eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced ....
s using the same general layout as the 305. Finally, there was a "Twin Six" V12, which was basically two 351s placed end-to-end with a common block and crank. A Diesel
Diesel

Diesel or diesel fuel in general is any fuel used in diesel engines. The most common is a specific fractional distillation of petroleum fuel oil, but alternatives that are not derived from petroleum, such as biodiesel, biomass to liquid or gas to liquid diesel, are increasingly being developed and adopted....
 version was called the ToroFlow.

305

The 305 had a 4.25 in (107.9 mm) bore and 3.58 in stroke (90.9 mm). The 305 V6 was the standard pickup truck
Pickup truck

A pickup truck is a light motor vehicle with an open-top rear cargo area which is almost always separated from the cab to allow for chassis flex when carrying or pulling heavy loads....
 engine for GMC from 1960 to 1966, and was one of the first V6 engines produced by an American company.

351

The 351 had a 4.56 in (115.824 mm) bore and 3.58 in stroke (90.9 mm). It was basically an enlarged 305. In 1972, the 351 was replaced by a 379.

379

The 379 had a 4.562 in (115.875 mm) bore and 3.86 in stroke (98 mm).

401

The engine was further enlarged for the 401.It has a 4.87 in (123.7 mm) bore and 3.58 in stroke (90.9 mm).

432

In late production there was also a version with enlarged crankshaft journals.

478

The 478 was one of the largest V6 engines ever built. Gross output was 235 hp (175 kW) at 3200 rpm and 440 ft.lbf (597 Nm) at 1400 rpm. Bore was 5.125 in (130.2 mm) and stroke was 3.86 in (98 mm). It was introduced in 1963 in the 6500 series trucks.

It was superseded by the 1966 478M "Magnum" series, and production ended by 1974. Gross output was now 254 hp (189 kW) at 3700 rpm and 442 ft.lbf (599 Nm) at 1400 rpm.

702

The V12 "Twin Six" was offered in United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 GMC commercial trucks, and as a special order option in Canada
Canada

Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean....
. It was often mistaken as two V6 engines welded together but in fact was a single casting. It used two separate exhaust manifolds, two separate distributor
Distributor

A distributor is a device in the ignition system of an internal combustion engine that routes high voltage from the ignition coil to the spark plugs in the correct firing order....
 caps driven off of a single distributor drive, and other parts from the 351. 56 major parts are interchangeable between the Twin-Six and the other GMC V-6 engines to provide greater parts availability and standardization. It produced 250 net SAE horsepower (190 kW). Torque was 585 lb·ft (793 N·m).

See also


  • GMC Straight-6 engine
    GMC Straight-6 engine

    GMC as a marque really only "owned" two engine designs, the straight-6 and a GMC V8 engine. GMC used many engines from other GM divisions, as noted below....
  • GMC V8 engine
    GMC V8 engine

    GMC generally shared engines with other General Motors Corporation divisions. But like GMC Straight-6 engine, GMC did have its own V8....
  • List of GM engines
    List of GM engines

    This is a list of GM engines, or more specifically a list of engine designs that General Motors Corporation has used in its various products....