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Old 05-13-2009   #12
niterydr
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24 Hours Rally Champion! 3D Pacman white house edition Champion! 3D Racing - Track 2 Champion! ATV Winter Challenge Champion! Bloody Pingu Champion! WRX Racing 2 Champion!
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Join Date: Oct 2003
Location: Elkhart Texas
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Re: Re-torquing ARP headstuds

Quote:
Originally Posted by MustGoFaster View Post
I assume you are using the right TQ spec? They are different for which type of lube you use. You can also try a slightly higher torque. We found it effective on Josh's car at delaying head gasket failure to a higher HP level.

You may want to lossen the nuts up and take them off just so you can besure they are nice an lubed up.
Yeah it helped to keep the heads from lifting, which was actually the failure, not the clamping force of the studs. The difference between 78 to 95 to 110lb/tq was huge.

Chris,

I'd say if you are already pushing coolant you won't stop it. The "path" has been found and it is exponentially weaker now. I would suggest to pull it apart, make sure your surface roughness value of the block and the head is what your head calls for, and put it back together. Typically ARP rates their fasteners at 75% yield strength.

Or go with a stronger (higher tensile strength) head stud.
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