You can also take a 1/2 nut and position it centered over the broken stud crap. Take an arc welder with 6011 rod turned up just a little hot so you are sure to get the arc. Ram the rod into the nut and pool it up to the top. Let it cool.... the weld may barely stick to the head but only barely and the heat from the weld loosens the stud and usually sticks really well to the stud and or tap. It may only pull the tap part first try but hit it again with another nut and it usually works. I saved many a turbo compressor housing this way....
oh yeah and the water pump housing on my 3.3 litre Intrepid!
Belden
