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Old 07-24-2003, 05:30 PM
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Torque Specs

I'm trying to keep my headers from leaking, so I've got a set of Mr. Gasket copper header gaskets and some header studs from ARP. The spec sheet for the gaskets gives different torque specs for both grade 5 and grade 8 studs, but my ARP studs don't say what grade they are, just stainless. They're rated at 170,000 PSI, what grade is that?

But that's not the only problem. The torque specs that ARP gives say the studs should be torqued to 45 ft/lbs with 30w oil. Is that the coarse threads for the block, or the nut on the fine threads? Also, the gasket spec sheet says that the studs should be torqued to 34 ft/lbs if they're grade 8 or 14 ft/lbs if they're grade 5.

I'm completely lost about where to torque what, any help would be appreciated.

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Old 07-24-2003, 05:42 PM
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Nevermind

Last edited by Stinky; 07-24-2003 at 05:49 PM.
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Old 07-24-2003, 05:54 PM
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id go by ARP's specs,they are far stronger than grade 8 bolts and making strong bolts is what they do.There proffesion depends on how well there bolts perform so they have to test and come up with there specs for each bolt and application.not tring to sell em off but they are supposed to be very good.well thats my two cents.Good luck

Blag
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Old 07-25-2003, 07:51 AM
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First, the 170,000 psi bolts I have seen are not stainless. I am not sure of the tensil strength of stainless, but it is less than 170,000 I believe.

Never the less, the torque specs are for the nut. You first screw the stud into the head hand tight. You will probaby have to chase the threads with a tap first so they screw in easily. Then install the nut and torque them down.

Also, I think you will find it impossible to get a torque wrench on all of the bolts. If you cant, just get them good and tight and check them periodically.

Chris
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Old 07-25-2003, 08:27 AM
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Ok, thanks a lot for that info, we're putting them in tonight. I got the torque specs from ARP's website. The studs are 3/8" stainless steel.

Here's the material specs:
http://www.arp-bolts.com/pages/tech/matspec.html

Here's the torque specs (look out, it's a PDF):
http://www.arp-bolts.com/pages/tech/images/fasttorq.pdf

I'll do what you said, tho, Turbo, thanks for the help.
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Old 07-25-2003, 08:54 PM
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Cool, I had no idea that stainless bolts exceeded grade 8 in strength. I must say that is probably exclusive to ARP's bolts. I think the cheapos are not nearly as high.

Chris
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