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Listen to Stretch about not heating the head.... cast iron is strong... but can crack due to uneven cooling...and if you have uneven heating... localized... you by definition have uneven cooling..
I would suspect corrosion before Locktite...as even RED stud and bearing mount...on a bolt that size only adds about five foot lbs of torque to undo it...
You have been doing all the usual correct things... except I worry about ' the weld broke'... if that is really what happened.... as compared to the bolt breaking.. so if you can retry that... use HIGH ALLOY ROD.....and try again.. welding a nut around a broken bolt sure has a high success rate around here... not only does it hold the bolt .. but also heats it really well... giving the chance that the expansion of the bolt will crush any corrosion at the threads... then when it cools.... leaves some clearance to let it come out...
I can not tell how much space you have... but there is a tool called a stud remover.. which has an off center moveable center which provides a large grasp on the stud and grips tighter the more grip is needed....
If you try the nut welded over the bolt.... file out the threads of the nut you are going to use...and find a grade 8 nut also....
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