GMC V8 engine

GMC shared some engines with other General Motors divisions. But like their straight-6, GMC also has its own line of V8 engines.

Non-GMC engines

Oldsmobile

Starting in 1955, for the larger trucks, the Oldsmobile Rocket V8 was available. In 1955 and 1956, it was 324 cubic inches. For the 1957 through 1959 model years, it was 371 cubic inches [1]

Pontiac

Prior to developing their own engines, smaller GMC's used the Pontiac V8 engine. They used the Pontiac 287-cubic-inch (4.7 L) engine for 1955 and 316-cubic-inch (5.2 L) engine in 1956, but advertised the engines as the "GMC 288" and "GMC 316". They used Pontiac's 347-cubic-inch (5.7 L) in 1957. For 1958, GMC reduced the bore of Pontiac's 370-cubic-inch (6.1 L) to 3.875 in (98.4 mm), resulting in a displacement of 336-cubic-inch (5.5 L). In Canada. For 1959, as the Pontiac engine's stroke was lengthened to 3.75 inches, a further bore reduction to 3.78 inches was done to keep the displacement at approx. 336 cubic inches (336.9).

Chevrolet Small-Block

From 1955 through 2003, GMC shared Chevrolet's small-block V8. This came in 265, 283, 305, 327, 350, and 400-cubic-inch (4.3, 4.6, 5.3, 5.7, and 6.6 L) sizes.

Chevrolet Big-Block

GMC also shared Chevrolet's big-block from 1968 through 1990 The company used the 366, 396, 402, 427, 454, and 496 cubic inches (6.0, 6.5, 6.6, 7.0,7.4 and 8.1 L) versions.

GMC engines

GMC's own V8 was the 637 cubic inch 60 degree engine based on the big block 478 cubic inch V6 (with two cylinders added). Production started for 1966 and went through 1972.

See also

References

  1. ↑ A History of GMC Trucks, James K Wagner
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