Exhaust Stud Problem.

[RB036]

One of my exhaust stud holes has been flogged out by previous owner. I tapped and installed a helicoil into the hole and it has flogged out as well. So now Im not going to be able to put q stander exhaust stud in there. What should I do? Drill, tap and install a bigger stud? Any help is appreciated thanks

[jiffo]

Going to be difficult to do a decent job in-situ.

When we pulled head studs in my trucks, I'd machine up stepped studs with larger diameter + thread length and coarse Whitworth thread into the cast iron block, then stepped back to correct size/thread above the block line so the head stud nuts still fitted due to the tight clearances to rockers etc.

Drilling and tapping into the block, keeping things nice and plumb was not easy.

[tridentt150v]

You could try a Timesert [or Bigsert if the hole is too big] , they are bigger in diameter than helicoils. But the stepped stud is the only other solution.

http://www.timesert.com.au/