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There were no Pontiac "Big-Blocks" in the classic muscle era. There was only the one Pontiac block used all the way up to 455. Olds, Buick, and Pontiac shared that block. Chevy, and Caddy both had their own seperate engine block programs. I do seem to recall a Pontiac block 350, not the same as the Chevy small-block 350, but not a Chevy big-block either. I could be wrong about that. But ALL Chevy motors under 396 were small-blocks.
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