Can I install 12mm exhaust mani studs in 1g

[BOBS90TURBO]

For some crazy reason, I just got a bad exhaust leak, and figured the 10mm bolt that I had drilled/tapped on the pass side end bolt has stripped out, now I need to re-tap thread it again with a bigger stud than a 10mm, but do not want to hit a water or oil pocket etc..

Any ideas?????

 

[Big Woo]

At this point you may want to consider having the hole Tig welded up, so that you can start over with either the 8mm or 10mm stud.

 

[Jimmy Jr.]

Good question. I have a junk head i'm going to drill out and see just how big one can go. I'll get back to ya.

 

[1SloColt]

I drilled and tap and helicoiled my head in three different locations without any problems using 12mm allen socketed stainless steel bolts. I didn't go in very far, probably 5 threads deep. Works perfectly.

 

[BOBS90TURBO]

Thanks for all the advise, I think I am going to tap it for 7/16ths course thread studs, they are a little smaller than the 12mm but much bigger than the 10mm, and the tread look deeper and stronger. I am doing in the morn. Thanks Again

 

[BOBS90TURBO]

*****FOLLOW UP****** I ended up re-taping all the studs with 7/16 1.25 course thread, they are smaller than 12mm with a much more stronger thread bite(these suckers will never strip or bust loose again. Rememeber the middle bottom stud goes right into the head,( watch the metal shavings on that one, I only went in about half way). But they did all fit with no problems .

 

[SlowSpyder]

If drilled and tapped correctly a 10mm fine thread stud would work just as well and not to mention not having to use both metric and sae tools on your car.

 

[1stGenRocks]

7/16th is 11mm so you dont need sae tools.