Both lower engine mounting studs on my Type III motor snapped off. Long-story-short, the threads on the originals were getting haggard, so I replaced both studs. I don't think I got as much as 10 ft/lbs on them before the snapped, and they snapped about 1/8" or so inside the case. Tried drilling them with a brand new bit, but it barely scrapes the surface. I suspect the metal was too hard and brittle, so when the threads were cut it created a stress riser - they were probably toast before I even installed them.
Oh, and I used blue LocTite when I installed them.
