Quote:
Originally Posted by Bruce of MN
It may not be the head stud holes, but isn't there some place where the proper tap used at the factory is one with less clearance and the tap from Ace is too loose with NOS studs? I don't know if this applies to modern studs.
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Yes most retap with the wrong class thread, making the suds loose in the block.
better way is cut a slot in threads of a old stud use, that to clean the threads.