Quote:
Originally Posted by davids2toys
Anybody know the minimum safe thread engagement needed for aluminum heads?
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The rule of thumb for steel is 1.5 times the bolt diameter. I can't find anything for aluminum. IMO I would feel very comfortable at 2.5 times bolt diameter which is 15/16 inch. At 25 ft lbs you may be fine at 2X bolt diameter. If you are talking with ARP you might ask them this question.