Not Ranked
er.....don't think Grade 9 bolts are recommended......I think they are too brittle, but since there isn't any bending moment in this application....plus apparently they have held up (above post). I'm not even sure SAE or whoever, ackowledges the existance of Grade 9 bolts..
Basically, the reason I never used ARP stuff anywhere except the rod bolts is that all the other applications involve screwing into cast iron, which isn't very strong. Only advantage of studs is for engines that come apart a lot.....saves the block threads as long as the stud doesn't unscrew
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