Hey 964, especially the DIY type. I had two broken exhaust studs that I finally got out after much time and energy. I will be installing helicoils in these two locations but since the engine is still together and I can't get the heads onto a machine for proper drilling and taping I am going to be making a nice drill guide tool. Guide will be held in position by large diameter feature and one (good) exhaust stud location.

The tool will center on the exhaust port itself which i measured to 1.48 inches in diameter (37.59 mm). Does anyone happen to know the exact stud spacing relative to each other? From my best late night measurement it is 66mm. I really don't have a way to scientifically measure the exact distance from the two center-to-center.

CAD model I made:

 

Stomski already sells a tool.

 

Cool thanks for the info.

Ouch, 268 bucks....will make myself. If someone needs it in the future I will lend it out gladly.

 

I have one similar from a guy on Pelican's board. I think I paid more like $180.