Running on 7 exhaust studs, Opinions needed wisdom optional Options

[wbgoggans]

To make a long story short... I had a bad exhaust leak. Bought new exhaust gaskets. Bought new exhaust studs to replace the exhaust bolts. When I tried to put one of the m8 exhaust studs into the one spot that had no exhaust bolt/ stud I found it to be much larger( damn you PO). I then went to the local parts store and bought the largest exhaust stud they had in stock ( m10). Even this is too small, so I’m estimating the po drilled it out to about an m12. Where can I even find an m12 exhaust stud? Am I going to have to have to settle for a bolt? Worst case scenario what are the odds I can get a good seal with just 7 exhaust studs? When will my project ever be done? What is the meaning of life? Should I just go ahead and buy a flat 6? I need answers!!!!

[Superhawk996]

No you are not going to get a good seal on only 1 bolt for the exhaust pipe that has a hogged out stud.

Check the head carefully. The stud was probably previously drilled for a Timesert, Case-saver, or Helicoil.

Since you reference a M12 size hole (almost 1/2") that seems like it is far more likely to be some sort of Timesert or Casesaver. Are you sure it is even tapped metric? DAPO may have tapped SAE. Just sayin'

I'd be surprised if you can get a M12 bolt though the exhaust pipe flanges or if the head has enough meat in the stud area for a M12.

Proper fix is to remove the head, weld up the hole and re-tap.

Alternately, if you can figure out what the head actually is tapped for, you can have a machine shop turn up a special stud. Say M12 on the threaded end into the head, and then M8 on the end that will go though the flange.

I'd guess the right shop machine shop might do it for about $80 for a custom stud. Or find a friend with a lathe and provide the beer! No more than about 1/2 hr of work. Likewise, a machist could do a SAE on the head side (if . . .that is what it is) and M8 on the flange side so you don't have to mix and match nuts.

Would be cheaper than head removal and welding and would be a reliable fix.

If you can't afford either of those fixes you definately shouldn't contemplate a six. (IMG:style_emoticons/default/laugh.gif)

Can't help you on the meaning of life - I've too have been stuggling with that one lately, given how crazy the world has gone.