ARP head studs tq #

Addicted2Boost · Post by **Addicted2Boost** » Mon Apr 27, 2009 2:51 pm

whats the tq specs for these I know you have to turn it to 80% i beleive then put the nut on then tq it to 100% but im not to sure. Also whats the 100% tq number greater responsibility

turbodudey · Post by **turbodudey** » Mon Apr 27, 2009 3:16 pm

The ARP spec says:

70 ft*lbs w/ ARP moly lube
or
85 ft*lbs w/ 30wt oil

Depending on the application you can go a little higher than the spec for extra clamping force. (this would be for high boost applications)

I'm not running super high boost (less than 20psi) and I've torqued mine to 75 ft-lbs with ARP moly lube.

Addicted2Boost · Post by **Addicted2Boost** » Mon Apr 27, 2009 3:24 pm

im not to sure what ones i have I got them off of erick so the 70 ft lbs would be full tq and the 80% would be where i put the nuts on?

turbodudey · Post by **turbodudey** » Mon Apr 27, 2009 3:42 pm

Addicted2Boost wrote:im not to sure what ones i have I got them off of erick so the 70 ft lbs would be full tq and the 80% would be where i put the nuts on?

The two different torque specs aren't for different studs, rather for different lubrications.

If you use motor oil to lube the nuts then the torque is higher than if you use the specially formulated ARP lube. Either way you get the same clamping force.

Also the torque spec if for the nuts only. The studs themselves can just be screwed into the block by hand. You can snug them up with a wrench if you want, but it's really not necessary.

esteinmaier · Post by **esteinmaier** » Tue Apr 28, 2009 8:44 am

Ignore his comment about the 80%. He's putting them in without taking the head off, and I'm having his get them all to about 80% of spec with the stock bolts still in, and then torqued full once they are all in and tight.

Remember not to snug them all the way down. You can bury them and then back out a half turn, but don't leave them buried or there will be play in the threads, and that's the quickest way to ruin a block I know of besides forgetting to put on a fuel system.

60trim · Post by **60trim** » Thu May 07, 2009 2:32 pm

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