Over bore: How far is too much ?

needsaresto said

THin wall,thick wall,it's an urban myth really. Any block from any year could be either depending on the casting process and core changes.

Have it sonic checked like said.

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100% correct! Dates should only matter if you have a super rare car or you are going for a 100 point restoration where you are anal about factory pant drips. I have a 1976 360 in the garage that is 40 over and it was my daily driver (driven very hard) for about 7 years with no problems.