My 91 EGT was missing rather badly and I couldn't quite figure out why. I tried a lot of things, and swapping plugs helped a lot. I found that the valve cover gasket was leaking, so I replaced that, but didn't have a torque wrench to get it locked down precisely. I wanted to throw on new plug wires, so I went to the local auto parts store & bought some. While I was there I asked if I could loan a wrench. They asked what size and what to set the torque at. I said 60-70 inch and a 10mm socket. He got it all set up and handed it to me. I started tightening with the center bolt and I gave a little twist, and POP the bolt snapped. He had it set to 70 POUNDS! Now, it's not on an edge or anything, and there are 3 center bolts. This one is dead center. I didnt pull the valve cover off to know if the break is flush with the head or not, so Im not sure if I'll be able to back it out with a lock wrench or not. If not, what can I do to get it out without paying a lot for service? Also, if I don't replace this bolt, do you think it will lead to oil leaking or some kind of serious problems? The engine is purring like a kitten now, and I think the problem was more the wires or PCV valve than the oil leaking onto one of the plugs like it was, but I'm not sure how bad of, if any at all, a leak this will cause.