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JTO JTO is offline
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Join Date: Nov 2002
Location: Rogue Valley, Oregon
Posts: 1,736
For those who care, it appears that the nuts backing off Raceware and ARP head studs does occur. The thermal expansion rate of the studs does not match the engine well. As the engine thermal cycles, the nuts loosen. The solution provided to me by someone that I trust very much in the Porsche world (Steve Weiner) is to retorque the studs very carefully during each valve adjustment. Ultimate fix, 993 TT studs. These you can torque and they stay that way. I had a good education today.

Past: 1975 911S Silver Anniversary-rebuilt and sublime.
Past: 1988 Carrera-backdated with a 3.6 and all the goodies.
Present: 2011 GMC 2500HD with the 6.0 & 4x4!, 2004 Toyota Sequoia (wife's)
Old 02-02-2004, 10:36 AM
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