Exhaust stud woes, What's the next step? Options

[saigon71]

Nothing is ever easy on these cars...

My heat exhangers got some oil in them from the bad oil cooler seals, so I decided to pull them for a good cleaning. One exhaust nut was really difficult to remove. Once I finally got it off, I saw that the threads were galled.

Ordered some new exhaust studs.

Went to work removing the old one after researching 914 world.

Heated stud boss with MAP torch & sprayed a bunch of PB blaster.

Welded a nut on the end...nut kept breaking loose without budging the stud, removing small portions off the top of the stud during the six attempts.

Then welded a bar to the remainder of the stud and used an adjustable wrench for leverage. Heat & PB Blaster, working it a little at a time, back & forth. It finally broke free. Reheat & apply more PB. On about the 5th cycle, the stud broke off below the level of the head.

Engine is in the car & I'd like to keep it that way. What are my best options for getting this thing out now...and installing a new stud?

I've had horrible luck with EZ-outs on other applications.

Thanks!

[saigon71]

Made three different fixtures so I could step drill the stud. My new exhaust studs came in, so I added the length of the stud threads to the thickness of the jig and marked the drill bit with tape:







Time to drill. Used a fine point red sharpie to mark the center punch hole in the stud, so I could see it through the pilot hole and tightened it down. Drilled right down the center. Aligned the next two jigs with the previous drill size and hole: