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As mentioned, have the block sonic checked then you will know just how far of an overbore you can go...

Exactly & I doubt you can go from 3.91" to 4.04"



Let me correct you on this, Robert, it's been done, way back in the days before sonic testers. That said, it is probably a rare 318 block that can go that far. These days, by all means, sonic the block, and prepare to be dissappointed.