ARP 12pt head stud torque specs...
Drifting
Joined: Jul 2000
Posts: 1,818
Likes: 3
From: SoCal
Re: ARP 12pt head stud torque specs... (Phil97SVT)
3 passes of torque, one at 30, one at 50, and one at 70 (on the main bolts) is what is recommended for the ARP head bolts. I'd imagine thats pretty close to what you'd want for the nuts on the studs as well.
If you find out different info, please post that back here.
BTW, on the small ones, 20-25lbft is probably enough.
If you find out different info, please post that back here.
BTW, on the small ones, 20-25lbft is probably enough.
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Re: ARP 12pt head stud torque specs... (Phil97SVT)
Since I'm about to install the ARP head studs soon, I emailed Mike Morgan today concerning this question and received this reply:
"We torque to 75 lbft making three incremental passes. Make sure the threads are clean in the block with no water in them. Turn the studs all the way down into the block until they bottom out. If they are hard to turn, you may need to use a stud tool or double nut the studs to turn them all the down. Do not put any torque on the stud once it bottoms out."
On ARP's website, the torque specs are distinguished by the lubricant used on the nut/stud. Using 30W oil the spec is 95 lb.ft. while using ARP's own moly lube the spec is 70 lb.ft. This is based on the premise that torque value is highly sensitive to friction at the contacting surfaces.
"We torque to 75 lbft making three incremental passes. Make sure the threads are clean in the block with no water in them. Turn the studs all the way down into the block until they bottom out. If they are hard to turn, you may need to use a stud tool or double nut the studs to turn them all the down. Do not put any torque on the stud once it bottoms out."
On ARP's website, the torque specs are distinguished by the lubricant used on the nut/stud. Using 30W oil the spec is 95 lb.ft. while using ARP's own moly lube the spec is 70 lb.ft. This is based on the premise that torque value is highly sensitive to friction at the contacting surfaces.
Burning Brakes
Joined: Apr 1999
Posts: 1,150
Likes: 0
From: Saratoga CA
Re: ARP 12pt head stud torque specs... (jmX)
Phil, congrats on the head studs. Why did you pick the 12 pt nuts instead of the hex? Is there a real difference or is it just the pattern? What kind of tool do you use for 12 pt nuts? Also, were you able to use these head studs with the engine in the car? I am hesitating on getting head studs because I don't know if I can use them with my engine still in the car and I don't want to pull the engine just to swap heads. Also, when you got the head stud kit, did it come with the equivalent for ALL the bolts? Like the 20 M11s and the 10 M8s?
jmx, looking forward to your how to guide on swapping heads. Especially since you mention you'll cover head studs and not just head bolts.
