Here's my experience with replacing the mounting bolts. Don't go with the hardened steel mounting bolts. They break before they bend and they break inside the stud hole in the engine (yes I used Loc-tite). They are so hard I couldn't drill a hole in them to use an easy out & they had to be removed at a machinist shop. I re-tapped 1/4" for threads and used re-thread from the local farm supply store for the replacements & now have no problem. If they do break again I can get a hole in them to use an easy-out. You can also make them long enough to work with easily and trim off the excess after every thing is securely mounted & tested.