Combustion chamber size and intake valve sizes are different between the two heads.Seems like there was a thread on here that said the cooling passages was different between the two heads but I don't know on that one.But the book states they arent interchangeable. They will physically bolt on, but arent meant to be interchanged.They never cut corners but the block is greasy? If they rebuilt it and didnt clean the block chances are they didnt clean much of anything else when they rebuilt it.Thats my opinion anyway.I think you would be better off to have your block fixed instead of buying another motor that may have a cracked block also. If it was me, I would ask to take the oil pan off and look.If they wont agree to that, I'd walk and find another or have your block fixed.
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