I just removed my motor mount bolts today. I must say that you should be concerned about stripping the internal hex head. One of mine came out easily, but the other was stripped. I tried everything, torch- bad idea, set the rubber from the motor mount on fire. Large torx head driven with a hammer into cap, it just stripped some more. Some people on this site suggested just drilling the head of the cap screw. The problem with that was, how would I remove the remnants of the bolt from the arm in the confined space. Some said to pull the whole arm from the engine, that looked difficult, and had its own perils. After alot of searching i decided to use a type of modern easy out. It is double ended, one side a indexed drill bit, the other a spiral easyout. With this tool you use a reversable drill set on reverse, bore the hole, flip the easy out and screw the easy out into the bolt. Now the bolt is supposed to come right out with only the power from the drill. However most drills don't have enough tourqe, and mine didn't either. I had to remove the easy out from the drill and twist the bolt out with a socket wrench. It worked. This post may seem long however, the process of me removing my stripped motor mount bolt took almost 2 years. As long as the engine wasn't hitting the hood, I figured I could put off the repair. Do yourself a favor and try everything in your power to avoid stripping those bolts. My advice would be - square edged hex driver, valve lapping compound, Some heat on the arm- but don't burn up your car. I hope my saga will not discourage you, Good Luck, Dave