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I did forget to factor in the case hardening but without testing it is an unknown quantity. If anyone has a bolt handy the head markings should indicate its grade. testing a stock bolt is really the only way to solve this.

why do engineers ever spec out less than the best possible. cost. what is in there has lasted quite well for the most part. so cost vs life cycle their choice was a success. getting the right clamping force definately is not an issue with higher grade bolts or ARP bolts grade 9 and up would...

this bolt: 9/16"-18 x 3" Yellow Zinc Finish Grade 9 Hex Cap Screw | Fastenal in a flange head with a length of 2-3/4 instead of 3 inches would be ideal

spoke with my father who is a metalurgist - he confirmed that all 3 grades are about the same - could test a bolt if i had one to give him. this means that the stock bolts are rather weak (~ grade 2) and even a grade 5 would be a major imporvement in strength. i would be pretty confident...

just a thought, but a lot of ARP's products replace bolts with studs. a reduced shank bolt doesn't provide any additional strength as the weakest point onthe bolt is in the minor diameter of the thread pitch. why not have a grade 10.9 stud or threaded rod machined then use hihg grade nuts...

is it a non-standard thread? Patracy, would you be willing to share the specs with me?