Thread: 351 Block help
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Old 10-31-2003, 07:48 AM
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TonyMadrid TonyMadrid is offline
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Join Date: Apr 2003
Location: Sparrowbush, NY
Cobra Make, Engine: A&C 351W, C4
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Default 351W Blocks
The earlier blocks were stronger; the base webbing was stronger. I believe from 1969 to mid 1974. Also the deck heght on those blocks was .023" shorter.

If you have a 1969 block you should be okay to overbore .060
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