Suggestions on exhaust manifold studs?

[laser001]

I've replaced my old cracked 1g exhaust manifold with a new 2g one. I broke 2 studs off in the process. One I was able to retap to the same size. They other I was able to fix with a helicoil. Since then the one I retapped is leaking coolant and the other one was leaking so I tried to retighten it and screwed up the helicoil. Any suggestions on the best way to fix these?

 

[hostile]

I used nickle antiseize tape on my studs. It is made for stainless but will also work on anyhting else.

It is rated for 2500f and -300 f so it should have any porblems. Basically it will keep them from breaking off in the head, and will also seal the threads.

You gmiht have to call around to find it, most people only sell the paste.