stock headstuds - high boost
This weekend I'm pulling the head to replace a leaking head gasket because the stock headbolts s-t-r-e-c-h-e-d. While I'm in there, I'm putting ARP headstuds, 280's, and dual valve springs 
Ran 30psi for a year, now there is a problem. Lasted longer than I thought they would Hope this helps
Ran 30psi for a year, now there is a problem. Lasted longer than I thought they would Hope this helps
Last edited by precisi0n; Jan 11, 2007 at 09:48 PM.
Evolving Member
Joined: Oct 2006
Posts: 212
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From: Dirty Jersey
This weekend I'm pulling the head to replace a leaking head gasket because the stock headbolts s-t-r-e-c-h-e-d. While I'm in there, I'm putting ARP headstuds, 280's, and dual valve springs Ran 30psi for a year, now there is a problem. Lasted longer than I thought they would Hope this helps
Ran 30psi for a year, now there is a problem. Lasted longer than I thought they would Hope this helps
honastly i say the stock head bolts are fine on the stock turbo. I dont really like the ARP head studs. why very simple.... Tim at AMS did the right thing when he put together the AMS/TMS head stud kit(yeah its more expensive but well worth it). The washers are actually larger than the ARP grabing more area of the head. they are also a H11 material which is quite a bit stronger than the $100 arps most people buy.
I say if your going high 28+ on the stock turbo and alky or a larger turbo go to the AMS head studs over the ARP units.
We run them on our 9.3 comp time attack motor at 25psi with out any problems yet!
In dsm world the stock 6bolt(thicker than 7bolt) studs have been pushed with 40psi on a gt42r 740whp. I am currently swapping to a 7 bolt block in my gt35r car. I will be running stock studs at 35psi.
99% that blow a gasket would blame it on head studs stretching.
99% of the time it would be detonation.
cylinder pressure for a the majority is in the 2000-2500psi range.
properly tuned this peak pressure will occur at 14-16 degress after top dead center. the piston is in a nice position to turn the crank.
improper tune results in 4000 psi at or near TDC. the explosion is instantaneous and the piston is straight up and cant rotate the crank. something has to give. the head lifts.
99% that blow a gasket would blame it on head studs stretching.
99% of the time it would be detonation.
cylinder pressure for a the majority is in the 2000-2500psi range.
properly tuned this peak pressure will occur at 14-16 degress after top dead center. the piston is in a nice position to turn the crank.
improper tune results in 4000 psi at or near TDC. the explosion is instantaneous and the piston is straight up and cant rotate the crank. something has to give. the head lifts.
