GMC V8 engine
Encyclopedia
GMC
generally shared engines with other General Motors divisions. But like their straight-6, GMC did have its own V8.
and Pontiac V8 engine
. They used the Pontiac 287 CID motor for 1955 and 316 CID motor in 1956, but advertised the engines as the "GMC 288" and "GMC 316". They used Pontiac's 347 CID in 1957. For 1958 and 1959, GMC reduced the bore of Pontiac's 370 CID to 3.875 in (98.4 mm), resulting in a displacement of 336 CID. In Canada
, however, GMC used the Chevrolet Small-Block engine
rather than the Pontiac.
. This came in 265, 283, 305, 327, 350, and 400-cubic-inch (4.3, 4.6, 5.0, 5.4, 5.7, and 6.6 L) sizes.
from 1968 through 1976. The company used the 366, 396, 402, 427, and 454-cubic-inch (6.0, 6.5, 6.6, 7.0, and 7.4 L) versions.
/pushrod engine. It used a 3.875 in (98.4 mm) bore and was produced only in 1958 and 1959.
While both the '58 and '59 GMC V8 engines were advertised as 336 CID, the '58 version was based on the Pontiac 370 CID, but with a smaller 3.875-inch bore giving 336.1 CID. The '59 version was based on Pontiac's 389 CID, but with a smaller 3.78-inch bore giving 336.9 CID.
.
GMC (General Motors division)
GMC is a manufacturer of trucks, vans, military vehicles, and SUVs marketed in North America and the Middle East by General Motors Company. In January 2007, GMC was GM's second-largest-selling North American vehicle division after Chevrolet, ahead of Pontiac....
generally shared engines with other General Motors divisions. But like their straight-6, GMC did have its own V8.
Pontiac
Prior to developing their own engines, GMC used the Chevrolet Straight-6 engineChevrolet Straight-6 engine
The Chevrolet inline 6 was Chevy's main engine from 1929 , through 1954, and was the base engine starting in 1955 when they added the small block V8 to the lineup. It had finally been completely phased out by 1990 in North America, but Brazil held on to their fuel-injected straight-6 through the...
and Pontiac V8 engine
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...
. They used the Pontiac 287 CID motor for 1955 and 316 CID motor in 1956, but advertised the engines as the "GMC 288" and "GMC 316". They used Pontiac's 347 CID in 1957. For 1958 and 1959, GMC reduced the bore of Pontiac's 370 CID to 3.875 in (98.4 mm), resulting in a displacement of 336 CID. In Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
, however, GMC used 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...
rather than the Pontiac.
Chevrolet Small-Block
From 1955 through 1983, GMC shared Chevrolet's small-block V8Chevrolet 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...
. This came in 265, 283, 305, 327, 350, and 400-cubic-inch (4.3, 4.6, 5.0, 5.4, 5.7, and 6.6 L) sizes.
Chevrolet Big-Block
GMC also shared Chevrolet's big-blockChevrolet Big-Block engine
The Chevrolet big block is a series of large displacement V8 engines that were developed in the USA during the 1950s and 1960s. As American automobiles grew in size and weight following the Second World War the engines powering them had to keep pace...
from 1968 through 1976. The company used the 366, 396, 402, 427, and 454-cubic-inch (6.0, 6.5, 6.6, 7.0, and 7.4 L) versions.
336
GMC's own V8 was the 336 CID OHVOverhead 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. It used a 3.875 in (98.4 mm) bore and was produced only in 1958 and 1959.
While both the '58 and '59 GMC V8 engines were advertised as 336 CID, the '58 version was based on the Pontiac 370 CID, but with a smaller 3.875-inch bore giving 336.1 CID. The '59 version was based on Pontiac's 389 CID, but with a smaller 3.78-inch bore giving 336.9 CID.
637
An unusual 637 CID 60° V8 was based on GMC's V6 designGMC V6 engine
GMC Truck produced a unique 60° V6 engine from 1960 through 1978. The engine was available in 305, 351, 401 and 478-cubic-inch versions. In late production there was also a version with enlarged crankshaft journals. GMC also made a 60° V8 with twin balance shafts using the same general layout as...
.