woodbutcher":3hoqnuvv said:Try using Kroil.Also get some LEFT HAND drill bits.Those have been known to back out the bolt when drilling the broken bolt out because of the heat generated.When reinstalling the header bolts or studs,use anti seize compound.Just a little hint.Do the same when installing new spark plugs too.Can save a LOT of discouraging words.Another hint.DON`T use grade 8 bolts.They are a real pain to drill if they break.
Good luck.Have fun.Be safe.
Leo