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  #11 (permalink)  
Old 06-07-2016, 05:44 PM
DanEC's Avatar
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Join Date: Apr 2009
Location: Little Rock area, AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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Originally Posted by davids2toys View Post
Anybody know the minimum safe thread engagement needed for aluminum heads?
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.
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