JB weld should work fine, it doesnt expand or contract and its good up to 500ºF

I have used JB weld to fix a stripped (and chewed out) threaded hole in a head where the rockers are mounted... Drove the hell out of that car too, 7,000RPM's daily in every gear for over a year after the repair was done... The guy I sold the car to has had it for over three years with no problems... The lower half of the hole still had threads, those were the only threads re-used... I did not use a helicoil or anything... I screweda newbolt down and filled the rest of it with JB weld through the missing chunk of metal shown below... Let cure for two days (overly cautious)...

Notice the lifted rocker arm bar?


And the stripped out bolt on the far right?


And the jagged hole that I used JB weld to repair...


SMo'