I'm getting ready to install some heads using ARP head bolts and thread sealer. My question is it really necessary to torque the bolts multiple times before use or can they simply be installed after cleaning the threads in the block and thread sealer applied to the threads?

 

For head bolts, you really want to torque, then run the engine for break-in, then torque again. This eliminates the chance of expansion/contraction messing with the bolts. At least that's how I've always done it.

 

Although retorquing after running the engine is ideal, most of us don't and haven't had any issues. To retorque the head bolts you would have to remove a lot of parts (rocker arms and exhaust manifold will be in the way). Follow the rest of the ARP directions (i.e. lube under the head of the bolts, torque the head bolts down in 3 passes in the correct torque pattern).

 

always worked fine for me.

 

Are you talking about multiple torquing before use? Or re-torquing after running? I'm assuming you're talking about torquing before use; I am going to go with the "follow manufacturer's instructions" which say torque 3-5 times before final torquing. What this does is polish the threads on the nut & stud to minimize friction during your final torque, so that there is as close to the amount of proper bolt stretch as possible. It's only a few extra minutes; I would do it.

http://arp-bolts.com/Tech/TechInstall.html

 

Agree with above, and also retorque after first warmup when possible/practical. But theoretically with modern head gaskets, the last is not necessary.

Rich

 

Also, make sure you use the torque value for the lubricant you are using. ARP moly lube requires less torque to achieve the same stretch because it's a slicker material. Don't use ARP moly lube then use the 'oil' torque specs, you run the risk of messing up your bolts/studs.

 

I have some Permatex High-Temp thread sealant, and planned on using some regular moly-lube under the bolt heads/washers. What should I torque them down to? 65, 75?