You are trying to ID a Chevy block you know it is a 4.0 bore 4-bolt main casting 3970010 and stamped CN0204221 you believe it was manufactured in 1970 not sure what vehicle it came in?

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1079493

2026-02-26 15:31

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Chevy block with casting #3970010 is not a 4-bolt main block---1968--327 cid/250hp A body car---1969-79-350 cid/185hp--car , truck , vette.

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