Striped head bolt hole! Help

[Jkole-4]

Hey was replacing my head gasket and my head bolts with arp head studs and one of the bolt hole striped. I'm getting a guy in to rethread the hole but I don't feel comfortable torquing them to 90 ft-lbs as I felt like this was gonna happen when doing the Third step torquing to 90. Can I torque them to 75 ft-lbs and still get a good seal with no problems.

[centralcoaster33]

Welcome to NICO Club!

That sounds high... 90 I mean. Maybe. Is your torque wrench calibrated or relatively new? And you're looking at the correct units of course?

Here's a link to another thread discussing the same. Not sure which engine you have and assume OEM SR20det.
arp-head-stud-torque-specs-t339445.html

As far as under-torquing them... I follow specs, so I wouldn't know. Maybe someone else has cut this corner and will reply.

Please let us know how it goes and good luck!

[Jkole-4]

Yea it what the instructions in the arp head stud box said to and my toque wrench is fairly new and only been used a couple of times

[Jkole-4]

Hey got the guy out today and he repaired it. got the head back on and was torquing them down to 75. The one he repaired torqued down to 75 fine but now number 6 striped at only 70ft-lbs so I'm just gonna get him in again to do them all and hopefully that does the job.

[centralcoaster33]

Okay, hope it all works out for you.

[PapaSmurf2k3]

Yeah I'd stick with 90 ft lbs and not go down to 75. You want that high torque for both clamp load as well as fatigue life/torque stability within the fastener itself. Typically you're supposed to run the fastener to ~80% of its elastic deformation prior to plastic deformation to guard against the fastener coming loose. 75 ft lbs is probably dipping down pretty low in that regard.

[amc49]

Hope you're not helicoiling there, rather use timezerts, as strong as the OEM if done correctly.