broken stud removal

[Kneale Brownson]

At 02:25 PM 12/19/2002 -0500, scott thomas wrote:
>Oh yeah, I have at least one broken exhaust stud. Just drill, retap,
>and install the replacement stud, or do I have to drill it oversize
>to accept a heli coil?

You might want to try a left-handed drill bit (provided your drill
reverses).   Use one a little smaller than the diameter of the unthreaded
part of the stud and the drilling action frequently loosens the stud enough
it comes out.  Then you might want a thread chaser, rather than a tap, to
clean up the corrosion.