I did the same on my 1990 rx7.
I took the biggest pipe-wrench i could lay my hands on, and used tons
of penetrating oil.

It came right out. (after about 2 hours).

Sudhir

On 8/10/07, Tom Rowsell <tom@geoexploits.com> wrote:
> Ok I might as well advertise my stupidity to the list: While removing the 8
> exhaust bolts from the heads, I was only successful in extracting 7. I
> twisted the last one off...got too confident/aggressive I guess. So, I'm up
> on blocks with no exhaust, and about 1/2" of bolt sticking out of the
> exhaust port. It's the upper one on the front, drivers side. I'm hesitant to
> do much else, lest I break off the last bit. I'll probably get it towed to
> someone competent, but would like to hear from some "advisors"  :)
>
> Thanks
> Tom
> http://tomrowsell.com
>