.030 over on a '78 440?

1098 Views 3 Replies 4 Participants Last post by wrenchtwister, Feb 26, 2002

troutbum

Discussion Starter · Jan 29, 2002

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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AHotRod

· #2 · Jan 30, 2002

No worries, .30 over will be just fine.

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bob palandrani

· #3 · Feb 12, 2002

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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wrenchtwister

· #4 · Feb 26, 2002

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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