Pulling and replacing exhaust studs

I have removed broken exhaust manifold studs sucessfully in the past using the "Studout or Screwout tools. They are a combo left handed drill bit and self threading left handed collet. You just select one that is a little smaller than the stud,center punch it, drill in and then use a wrench on the collet which will grab the inside of the drilled out stud. Carefully work it out in a CCW direction. But first heat up the area with a torch and then soak with Marvel mystery oil penetrant at least overnight. When drilling the stud, go slow, with very little pressure, the Studout drill tip is a titanium alloy and will go through any steel, but if you snap it off then the only way to get out the broken part is with a diamond tipped Moto tool tip. They are lifetime garunteed, if you break one, just send in the pieces and they will send you a new one, no charge. The unbroken studs I would heat up with a torch and soak with penatrant over night, then use the double nut method or buy a stud remover. This method worked for me more than once. Good luck and go SLLOOOWWW. JMTCW

Thank you. Just how do I go about heating up the stud? I assume a propane torch. Could I damage the head?