Jim (sorry I missed that post) & Tim,
May I refer you to this quote from post #12. Info I posted from GuzziSteve.
Head bolts should be backed off 1/8-1/4 turn before re-torque, and I go to 33ftlbs on the 4 big ones and 23ftlbs. When you back them off you may hear them pop a bit, that is normal. I have seen them leak at 30-32ftlbs.
The reason for cracking off is two fold.
1. Pete Roper says they over torque at the factory.
2. You need a moving fastener to properly measure torque.
Because you're only cracking off and not installing a new gasket for the first time there is no pretorque step. I.E. just cracking off you're not loosening enough to need the pretorque stage.
Just tighten fastener to the proper final torque.
I forget if I did one at a time or cracked all then tightened all. It was probably the latter.
I'm not sure it matters.
Gaskets can usually be reused, especially if you coat them lightly with grease before hand.
Gaskets seem more likely to leak if you don't have a spare handy on the shelf. 😉