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Cometic will make it any way you want it. So 4.530 is a safe bet. I have 4.530 and 4.560 here. Both were custom made as we added some steam holes as well.


I agree, and any Cometic dealer can get them for you.
Keith Black racing engines stocks MLS gaskets for 4.500 bore blocks and I believe they are 4.560. Give them a call, the last I heard they were $76.50 each.