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Henry, were the "found" studs on an engine that came to your shop? I like your lifetime gaurantee! ...nice engines!
I think "shifter" has it right, most OD threads are rolled these days.
Here is copy from a site that sells ARP studs:
"our Porsche 911/914-6/930 studs have rolled threads, fine threads at the head end of the stud for more accurate torquing, and include a 12-pt hardware kit, complete with nuts and washers, and ARP's special torquing lube."
More:
"The ARP 2000 material used to make our Porsche 356, 912, 914 and VW Type 1 and 4 head studs, thru-bolts, and connecting rod bolts is about 33% stronger than the stock material, with a 220,000psi tensile strength and improved fatigue characteristics. That’s even more than typical chromoly studs which advertise strengths of 180-190,000 psi, but rarely live up to their promises! Additionally, our ARP studs have rolled threads and the ARP 2000 material does not suffer from stress corrosion and hydrogen embrittlement, providing care is taken during installation. "
I wonder what the the ARP stud is made of and the factory 993 stud material?
Last edited by MotoSook; 06-08-2004 at 12:00 PM..
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