Well, I snapped off part of the right front cylinder head exhaust stud and it started backing out when removing my front head pipe: I have sprayed the stud with PB Blaster and will double nut it and back it out. A couple of questions: If it will not come out, can I leave it in and use it (assuming there is enough stud left)? When installing a new bolt, do I put anything on the part that goes into the cylinder head? After researching repairing studs, it seems the threads should be lubricated with oil before torquing the nuts. Does anyone do this?