Is the manifold on the engine? IF it is take it off and try and grab what is left of the stud with vice grips. Heat with a torch and melt some candle wax in the threads. Seems to work good. I have had luck with this a few times.
Never used candle wax. But we used to use toilet bowl ring wax stuff and that worked like nothing else I have ever come across. I would imagine the candle wax works very similar. The heat just sucks the wax right into the threads and it doesn't really burn off or evaporate like wd40 or PB blaster would on heat.
I have gone through this twice now; once on a 4.3l chevy and once on a Bronco with a 351w. Both times I ended up having to center punch the stud and drill them out starting with a small bit and working my way up to the size I needed. Then I tapped the hole and put in a new stud.
Just be careful turning the stud. I usually lightly tighten and loosen the bolt until you can feel it turning. With the heat the bolts will snap off a little easier. But just work it back and fourth and you shouldn't have any problems. Heat is amazing.
every one here is right but would have to agree with bishop the most because all methods mentioned are tried and true and my experince agrees easy outs are not so easy
I have had decent luck by drilling a relief hole in the center. Heat the hole area hot hot. Take cold water and cool it as quickly as possible. Wax works real good as well.. good luck
well i managed to break them off deeper into the head... Turns out they use hollow bolts. looks like my job got easier
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