Not Ranked
Unless you absolutely have to have a numbers matching car, there is no reason to bore a 390 or 428 block .060 over. These blocks are readily available.
Under no circumstances should you bore a 427 more than .030. They start with a thin wall to begin with. It would be better to run a 427 with 8 sleeves rather than boring one .060 oversize.
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Jeff
“If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower.”
Mark Donahue
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