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Howdy,
Quote:
Originally posted by Michael C Henry
A 390 is 4.050" .075" over makes it 4.125" that is stock fot 406 and 428.
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Standard bore on a 406/428 is 4.130" not 4.125". I've seen alot of 65-70 390 blocks go 4.13" and some go 4.15". I even seen a couple of 428-4v blocks go 4.223", which is std 427 bore. I saw 1 of these yesterday at the machine shop. Pretty neat. The machine says he has never had any problems boring a 428 block to std 427 size.
Paul
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