krazykuda is right. The factory spec is for clean, lightly oiled threads. Using ARP lube reduces the friction and requires you to drop the torque spec down, but by how much? Who knows? Just use good quality oil on clean threads. I've torqued hundreds of head bolts with just oil and never had a problem.
Also, remember to put a couple of drops of oil underneath the bolt head where it rubs on the head.
