stripped exhaust manifold threads

[modulation]

So I stripped the threads inside the head that the exhaust manifold bolts thread into. I guess it was just time as I put like less then 20 pounds of torque on it and the bolt wouldn't hold torque so I pulled it out and sure enough the threads came with it.

I've searched but I can't find the size of drill bit I'll need to drill out the hole or the size of the heli-coil I need to put in.Anyone know?

Also any chance of passing emissions with one bolt with no torque like this?Unfortunately it's like the first bolt instead of being one more towards the middle of the manifold.

All this **** for emissions..

[japmaxs14]

Damn this post was never answered over a year old HELLO !! Nicoclub!!

Well I got the same problem except mine is located near the back and one of my studs are stripped as well.

[ob1]

the bolt size are 10mm x 1.25. the helicol kit come with every thing needed just buy the kit for said bolt size. I have the same problem the two outer bolts have stripped

[airman86]

you might have luck grinding the studs down, and using a reverse drill bit to back them out.

[89sxcoupe]

you might have luck grinding the studs down, and using a reverse drill bit to back them out.

iv noticed whats helped alot heat up around the bolts and use a can of air held up side down right on bolts when u back the out after they snap helps alot

[airman86]

good ole' thermal expansion

[Ikera]

I have 3 bolts missing the manifold stays in place fine for now. I at first I was little scared of high RPMs but it actully holds up to 6,000 RPM with out any gas blowing pass it. But I am planing on fixing that problem soon.P.S. I've passed emission test in BC, but I think it's a lot more strict in CA