I stripped the threads in my head when I was removing the heater box so I could replace the copper seal in the exhaust port. Didn't break the stud off inside the head luckily, but it was a pain in the ass to repair. I got a time-sert kit and drilled out the hole big enough to tap it in, then threaded the exhaust stud into the time-sert. It worked and it's held up over the last couple of years, but it was extremely nerve-racking work! Trying to keep the drill steady and straight while drilling into the head (on your back upside down) was the toughest part. I hope I never have to do a job like that again.

Looks like you've got your work cut out for you... I hate to see that kind of stuff.

I've heard you can weld nuts on to the studs, BUT if it broke off the first time.... its going to twist off again. I've never had luck with that method either.

  one down two to go.

That truly is impressive you got that one out.
Kudos to you.
KC