I have one snapped bolt on my exhaust manifold.
The one circled on that wikipedia image.


How hard is it to fix this? The exhaust isn't leaking but i was thinking about putting dual pipe headders on but the bolt is going to be a problem in the future..

Also should i custom make 2,5" diameter headders or get dutra duals?

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for a second there I thought the pic was of your engine and I was going to say...you're engine looks great to me...

anyhow, you can fix a broken stud by drilling it out and retapping the hole with larger thread diameter. You'll have to drain the coolant below the head level, and be careful not to let the bits get into the cooling jacket. The best way would be to remove the intake and exhaust manifolds so you can get to the area easily.

If there is any part of the stud sticking out, you might be able to work it loose with heat/penetrating oil/time/patience and get the old one out. Is it broken off cleanly with the head surface or is there some of it sticking out still, i.e. enough to grab with vice grips?

brian

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For what it's worth, that is a common problem with the slant 6 engine. Too many people, who can't read the torque specs cast right into the factory intake, overtighten the nuts. This leads to warping of the exhaust manifold, and breakage of the stud, or worse yet, cracking of the exhaust manifold.
'67 Dart has it right. Drill it out, and if you're lucky, you can save the threads and install an equivalent stud. If needed, there are studs made with a larger size on one end. That would allow you new threads in the head, but original appearance on the manifold.

My T-bucket has been running around all year with that very same stud snapped off, with no exhaust leakage, (so far). I do intend on correcting that when I take the car back apart to make changes and correct small problems.

Roger

Remflex gaskets might help seal it even without the stud there, if your manifold isn't warped too much...

http://catalog.remflex.com/MOPAR_Header ... p/6008.htm

Brian

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When I replaced my intake I had one stud strip out on me bad. I used a small 3" pipe wrench to get it out. I wouldn't use a "cheater bar" for if its really stuck you might do more harm than good.

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~Nic

I allways start by drilling them out with a reverse drill bit,sometimes they come out like useing a easyout.

cool tip, MadMax...

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Hello sir, I was wondering if you could direct me to the larger manifold studs that still have the 5/16-24 on the intake/exhaust manifold side and larger on the head side. I have a stripped thread.

Well, crap! I may have been spewing bad info out of my pie-hole. The only studs I found were from Dorman, and they're only 1.25 inches long. The 3/8-16 by 5/16-18 is just what's needeed, but a touch too short.
I'll keep searching.

Hey! This may be just the ticket. A bit pricey, but if you only need one........
https://www.raceplumbing.net/ARP-AJG175 ... 47281.html

Roger

Manifold stud Discussion Can be found here!

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http://www.youtube.com/hyperpack

Heat will help. A propane torch is usally enough.

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1976 Feather Duster /6 4sp
1984 W100 318 727 np241
1972 'Cuda 340 4sp
1985 D250 360 46RH