snapped a headstud...
If you find that your other studs may have been over-torqued at any point in their life (i.e. torque wrench being off, previous owner/shop overtightening) then you should replace them all as they all may have some plastic deformation and will not provide proper sealing pressure.
Was this the first time you've ever torqued that certain set of ARP's? If you reused them, then go ahead and replace them all and use a new head gasket since they crush and can only be compressed once. I recently reassembled my friend's car and torqued the studs to 93 ft/lbs in increments (30-60-80-92-run the car to break in the cams-93) using ARP moly assembly lube on the nuts and washers while screwing the studs into the head dry.
3 steps are all you need and the last step should be 1.5+ times the second step.
IE - 30-45-85 of if you like 95 go 35-50-95.
This allows you to get a more true torque/clamp load. Rather then getting inaccurate readings from the coefficient of friction of starting the twist. If the torque wrench only turns a HAIR and then clicks.. your readings will be more inaccurate then if you finish with a 1/4 twist ending in the click. Indicating that more then likely your torque was based on clamp load - not twisting/screwing friction.
Thread
Thread Starter
Forum
Replies
Last Post
lemmysports2
Evo Engine / Turbo / Drivetrain
7
Apr 5, 2012 06:12 AM
