Quote:
Originally Posted by George Miller
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.
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I've recently gone through the same thing after someone chased the threads in the diff (the ones for the bolts holding the trunpets on). They leaked so much, I could end up with an empty diff without moving the car!
Many tapped holes have been ruined this way over the years and it is still happening. If tighter tolerance taps were available, maybe some would be saved. I've been usung the "grooves in an old stud" for 50 years. Sometimes, I even heat the stud to cherry red, quench it in oil, then cut the grooves.