Do NOT re-torque a hot (or even warm) head, unless you like your head cracked.

The procedure I use is to fully warm the motor up to operating temp, to the point where the T-stat opens, and then beyond that until it reaches standard operating temp. Then shut it off and allow it to cool *completely*, like overnight. Once it is COMPLETELY COLD TO THE TOUCH, re-torque the head bolts/studs in order, to the proper spec. I have also heard the recommendation to very slightly increase the load on re-torque by 1-2 ft. lbs. so you are sure you are getting enough "bite".

Do this again after 500 miles, and you should be good to go for a long time.

-Jeff