Bump!
Tire slayer
Breaking everything since 2011
"As I lay rubber down to street, I pray for traction I can keep. But if I spin and begin to slide, please oh please protect my ride."
One-off SRT Top Mount Manifold - GT3076R
My Ruckus Build
The standard ARP torque rating for high HP turbo K's using the 3/8" studs is garbage. You will push coolant.
First time I lifted the head was after 22psi boost cut at 80ft lbs on the studs. I retorqued the studs to 90ft lbs and lifted the head again at 26psi boost cut. I then replaced the shitty Cometic HG with a Cosworth HG and new ARP studs, torqued to 100ft lbs. Have seen 26psi with no problems now.
Yes, I just shared some sweet secret info...
I just went thru the same thing or am in the process of it at least ..I lifted the head on my engine on the dyno at 23 lbs of boost 640+ whp last week . ARP head studs were at 80 ft lbs per my snap on torque wrench. I was also running a Cometic head gasket .The head and block were just refinished and have since diassembly been been confirmed straight and true .I now have an OEM head gasket ,Arp assembly lubricant I got from Jegs for the top of the studs as we didn't use it when we put it together and I have spoken to arp and confirmed the torque to be 80 ft lbs on the studs .Funny thing to me is I have run unopened K 20s with only ARP studs to over 30 lbs of boost many many times on stock head gaskets and never had an issue.Therefore I am probably sticking with OEM head gaskets from now on .
what about using GE headstuds/A1 headstuds? I just had my head slightly lift at 21lbs on arp torqued at 80. im going try a1 headstuds with oem gasket
2001 Boosted Built k20a2 Billet BB 6766BB
2013=579whp 406trq @ 24 psi c16
10.87@137mph
2014= 510whp 370trq @ 18psi pump gas
2015= 7xx @ 30psi??
Hell Mines apart right now and gonna go back together later this week. I have the ARP studs now but hadn't consider the others I just assumed everyone ran ARPs .I guess I am about to do a little google searchin
THe legit fix is to use 1/2" studs.
Well machining the block and head at this time is out of the question as it just got together many have used the 7/16 studs w/o issue and I am gonna try it again .I now have all the stuff to do it and a newly calibrated torque wrench so I'm gonna re assemble it with the standard arp studs and hope it holds this time .
Problem is rethreading for 1/2" studs when the motors built already and in the car.
Tire slayer
Breaking everything since 2011
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