Exhaust studs on 318 - Help

[71D100]

I pulled a real bonehead move the other day. As I was retightening the exhaust bolts and studs, I accidentally, not once, but, twice, overtightened the studs and snapped them clean off. My question is a simple one, are these pressed in the head or are they screwed? and am I now screwed? Can I remove them with an easy out? I should have put headers on it to begin with and had the machine shop remove those studs, but, I didn't think the metal was that poor.

Thanks

[Jeffc]

The most common studs/bolts to brake are exhaust studs.
With the constant heat and cooling that they go though
they tend to crystalize and weaken over time. Not to say anything about the fact that some of them enter the water jacket on the head, thus they tend to rust on the back side.

Yes you can drill them and then try a ez-out, then tap the hole to clean it up.
Sometimes there too far gone for it to work, then you
have to drill the old stud/hole, tap the hole oversize and then use a insert to bring the hole back to size.
A right angle drill often comes in handy when doing drilling studs in tight spaces.


I like to use a wire feed welder and weld a nut on the end of what is left of the stud, this super heats the
stud when you weld on it and helps loosen the stud from the castiron. The weld does not like to stick too cast and will tend to stick only to the stud.
It sometimes takes a few trys to make it work, but it does every time and I have not had to drill or use a ez-out in years. Just chase the hole with the right tap when done and put the new stud in.
If you have a wire feed give it a try, or if you got a friend that does give them a call, it is well worth the time.

I also use new studs anytime I am installing a new header, exhaust man, or have head work done. It also has paided off over the years. Keeps the stud fresh and less likely to be a problem later on down the road..... one of those "pay me now or pay me later" things........

[71D100]

Thanks Jeff, I was afraid of that. Unfortunately in my situation the studs broke off inside the hole leaving no way to get ahold of it. I guess that drilling and tapping will be my only option. Just when I thought it was safe to go onto other parts of the truck...

Thanks again

[Jeffc]

I have even used the welder trick with studs below the
cast, like I said the weld does not like to stick to cast.
May make the area around the hole look a little ugly
but still works...........