Well I managed to break a bolt hole on the right side engine block valve cover.
So I had to come up with a way to fix it without welding.
JB weld, a stainless steel collar from lowes, helicoil fix-a-thread.
tap the steel collar, got a 1/4" x3/4" x 3/8" I think, the 1/4" hole was a good match to the helicoil M6 thread saver, no drilling just tap the collar.
Then put 2 of those fix-a-threads in the collar make sure to use lock-tight, and then jb weld the whole thing into place.
Most likely you'll need to touch up the area with a drill bit to make it fit nicely.