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I have 440 the bore taper is just within spec, I want to save myself another teardown in 40-50K, So I am going to overbore the cylinders. I read somewhere that the later 440s had thin casting walls and the .020 was the recomended maximum. Any truth to this, anyone gone .030 over with a 76-78 440? It seems like .030 pistons are a dime a dozen but I don't see many .020???

TIA
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I disagree don't bore your block unless you get the block sonic tested the walls are very thinI believe there are plenty of older or pre 73 blocks around . good luck in your venture
 

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I heard the same thing about the newer 440's, I just used an older block to be on the safe side. A little now is better than a lot later
 
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