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Old 05-16-2012, 09:53 AM
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1971BB427 1971BB427 is offline
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Your casting number is a '73-'85 BBC 454 car/truck motor. Pretty common and standard engine. Maximum over bore is not what I'd consider, as it leaves you nothing in the future. Some 454's have been bored .125", but each has to be looked at for core shift, or other indications of a possibble issue when going that far.
Most people would consider .060" as a safe maximum that doesn't require any special work to determine cyl. wall thickness. I personally like to stick with .040" max, as it leaves me another safe step if I ever need it.
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