GMC V8 engine
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GMC generally shared engines with other General Motors divisions. But like their straight-6, GMC did have its own V8.
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[edit] Non-GMC engines
[edit] Pontiac
Prior to developing their own engines, GMC used the Chevrolet Straight-6 engine and Pontiac V8 engine. They used the Pontiac 287-cubic-inch (4.7 L) motor for 1955 and 316-cubic-inch (5.2 L) motor 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 and 1959, 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, however, GMC used the Chevrolet Small-Block engine rather than the Pontiac.
[edit] Chevrolet Small-Block
From 1955 through 1983, GMC shared Chevrolet's small-block V8. 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.
[edit] Chevrolet Big-Block
GMC also shared Chevrolet's big-block 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.
[edit] GMC engines
[edit] 336
GMC's own V8 was the 336-cubic-inch (5.5 L) OHV/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-cubic-inch (5.5 L), the '58 version was based on the Pontiac 370-cubic-inch (6.1 L), but with a smaller 3.875-inch bore giving 336.1 cubic inches (5,508 cc). The '59 version was based on Pontiac's 389-cubic-inch (6.4 L), but with a smaller 3.78-inch bore giving 336.9 cubic inches (5,521 cc).
[edit] 637
An unusual 637-cubic-inch (10.4 L) 60° V8 was based on GMC's V6 design.
