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Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. The external dimensions of all their V8s, from were the same. Engine displacement is a function of bore and stroke. Pontiac's V8s share the same connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V.