Thanks for the attention Theo, I have talked to ARP and they spec the shorter of the two 460 head bolts at 9/16,12 tpi and 4.475 inches long. I am pretty convinced these would be close enough to the 41/2 inch original bolts but they are >$10 each. Has anyone else had experience with torquing these h...

Hi all, I have a 1965 Chris with the 430 Lincoln and am having difficulty with head bolts. I attempted to reuse the original bolts and with oiled threads I broke a bolt trying to get to 140 ftlbs. I then attempted to use a Fastenal 41/2" 9/16" bolt that was supposed to be grade 8. I had figured out ...