[yelcab1]

I am repairing an exhaust leak on a 1972 911S (magnesium case). It's cyl4, one of the two exhaust studs has pulled out of a case due to a very bad job by the previous engine rebuilder. The hole was improperly drilled, a helicoil was used instead of a Timesert, and now it has pulled out of the head. The hole is oblong, and is too big for an M8 Timersert.

This hole is the stud where the barrel nut goes on to, not a hex nut.

Ok, what are my options?

1. next size up metric, helicoil, time sert ? With a allen head bolt?
2. Next size up standard size, helicoil or timesert? With an allen head bolt?
3. Welding, brazing, glueing in a stud? I can't weld magnesium ...
4. Tow the car to a welding shop? Remove the head and bring it there
5. Replace the head

?????