4.600 x 4.250 = 565
4.600 x 4.300 = 572
4.560 x 4.300 = 562
4.600 x 4.300 = 572
4.560 x 4.300 = 562
565 Question
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It could be worn out if it was a 4.560" bore, not sure I understand your question? What's the piston to wall clearance?
My 565" was built in '93 it has 100's of hours on it and 100's of pounds of nitrous through it. It was honed numerous times after years of abuse and a few holed pistons just this year it received a fresh bore 4.606". The A-460 blocks have a lot of nickel in them the bores are very very tough. If the the piston to wall is high the block can be bored in quite a few steps before maxing out at 4.625 + Sp long as you can get a ring that fits you can bore it many ways, .06, .10., .12, .15 etc
G-
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