With a bore of 4.300x4.375 stroke it makes a 508. You can bore the existing sleeves just like any block. If they end up unservicable, they are replaceable. I'm not going to make an undersquare engine. It will be 4.280 x4.250. I thought about doing an odd ball engine just to be rare, but it adds stress to the pistons limits the rpm potential a Hair.....
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Todd
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