How far can a 85' 351w block be bored out?

deion82

Founding Member
Sep 14, 2002
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minnesota
How far can a 351w block be bored out and still be safe for highpower. I took my block to the machine shop and we put a bore dial indicator on it and the worst hole has .020" taper. So i'm looking at least .040 or .060" bore. Thanks