I used a single cylinder heating torch (don't know the gas name, but like a Oxy/Acet torch), got it almost cherry red. But the vise grip just wont grip nicely.
I've looked for the socket, if I find it, I'll post the link.
Gordon
How much stud is sticking out?
Your going the wrong way around. Heating causes metal to expand. By heating the stud you are making it tighter in the hole. You want to WARM up the cylinder head with the torch around the outside of the stud. DO NOT heat the cylinder head to cherry red . Do a circle around the stud trying not to get heat on the stud. When the cylinder head is too hot to put your hand on then try undoing the stud. Another trick is to spray some WD-40 or oil lubricant from an aerosol can on the end of the stud once the cylinder head is warmed up. Do this outside because you will get a lot of smoke The oil will take the heat out of the stud and will also wick up the threads of the stud to help loosening it. Sears sells the rotary stud remover or KLM or KTM Tools should have one
Dusty