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I can't give you an exact year based on casting number alone because Chevy used that casting for several years from 1969 through the mid 1970's. It's one of the better (and more common) 350 block castings. It can be either 2 or 4 bolt main, depending on what it was originally used for. As long as it's in good shape, it's a great block to build.

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10y ago
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Q: What year is a 350 Chevy engine with casting no 8970010?
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