I use whatever manufacturer specs who made the bolts or studs. If using stock stuff, I go with the factory specs. ARP for instances gives specs for their bolts and studs. If I use ARP I use their specs. Kinds simple, really.
I was minus 10 pounds on my W2 heads and they cracked. Calibrated digital snapon torque wrench. I just read today about a guy cracking a set of 360-1 heads. Hmmmm
