flux core wire not the best for this job of bolt removal.
vise grips on nut then ground clamp on engine block/head or vise grips if you have to but best on block .
center on the broken bolt then work it out in to the nut and fill in the nut so you get lots of heat in to the bolt .
also clean the broken bolt area good n shinny also if at all possible.
and gm updated the bolts to a 13mm head with flange over the tiny original 10mm heads .
and ford does studs and those pop just as bad .
vise grips on nut then ground clamp on engine block/head or vise grips if you have to but best on block .
center on the broken bolt then work it out in to the nut and fill in the nut so you get lots of heat in to the bolt .
also clean the broken bolt area good n shinny also if at all possible.
and gm updated the bolts to a 13mm head with flange over the tiny original 10mm heads .
and ford does studs and those pop just as bad .

. Get the weld nice and hot then let it cool for 15 or 20 min before you try to spin it out, thats were I went wrong till sweetk30 helped me out.





