I Could not achieve a repeatable Torque Value on the Main Studs when Assembling a World Aluminum Block, then 1 Main Stud snapped in half !! Some had seemed to be "stretching" excessively @ 100ft/lbs just prior to this ? Upon removal and further inspection, I THEN noticed, that although the Nuts had "ARP" on them, the Main Stud Ends themselves DID NOT ? Fooled me up until then !
A subsequent Phonecall to ARP, confirms ARP Studs do indeed have "ARP" on the ends.
I Removed the suspected "Chinese" studs, and found they were "stretched" visually thinner in areas on the threads, from the Rec'd 100ft/lb Torque applied. Mic readings indicated many had indeed shrunk by .030" in Diameter at their weakest threaded points, and were also about to break !
CHECK your World Products Aluminum Blocks, and make sure your Main Studs themselves have "ARP" on the end, NOT JUST THE NUTS !
I will not comment on the phonecall I had with World Products ! however, I am still unsure how NON-ARP Studs? get mated to genuine "ARP" Nuts as delivered from World Products?
