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Exhaust manifold to pipe dount adapter

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1982AMCConcord View Drop Down
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    Posted: Sep/22/2020 at 1:24pm
Hello all.

I am using early model full length OEM free flow exhaust manifolds on my Concord's 304 and I'm wondering if I need to use the exhaust manifold to pipe donut adapters. The reason for me wondering about this because the exhaust manifold seems to be ticking really loud on the pass side and when I went to make sure they were seated in place I realized the exhaust shop didn't install any. From what I can see they did use the thin crush washer with the blue circles I'm pretty sure they're not adequate. Are these the correct ones? They go on both sides correct? Do I need the washer gaskets with the  blue circles as well? Also... I have 2&1/4 size pipe. Thank you.






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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1948kaiser Quote  Post ReplyReply Direct Link To This Post Posted: Sep/22/2020 at 5:07pm
that is a flange on the end and not flat?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kreep Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2020 at 6:50am
I just used the donuts that looked like the ones in the Mahle pictures, but they didn't hold up well to lots of flex and abuse until I found some old stock solid steel donuts at the local exhaust shop.

Did the shop install the correct inlet to the exhaust pipe? It has to match the donut or it won't seal.

I wouldn't bother with the blue rings unless you have a sealing problem between the manifold and donut.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2020 at 7:54am
Hard to tell exactly your setup, however my 72 free flow dogleg manifolds with 2-1/4" pipe uses Fel Pro 60103-1 gaskets.  Google it - they come up all over and can be found for under $5 online...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2020 at 8:05am
I happen to be in an exhaust projec tright now...  The Fel pro 60103-1 is 2-1/8" as I mentioned for some manifolds and for the Machine and possibly later free flows could be Fel Pro 60538 (2-1/4").  I guess it would be a question of which fits best based on your manifold year.  My 60103 is a little loose in my manifold, I'm starting to wonder if I need a 2-1/4" so I just ordered one to try it. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nor Cal CJ5 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2020 at 1:58pm
Are you using a exhaust flapper valve on the passenger side?  These changed from 2-1/4" to 2" in 1974.

Your 1982 Concord probably came with a 2" flapper valve which still can be found.  The 2-1/4" one are harder to locate for the earlier manifolds.

So on your passenger side you have a pre 1974 exhaust manifold, re-using a 2" flapper valve, and a 2" exhaust pipe - right?  

You need a flat gasket from the exhaust manifold to flapper, and a properly sized doughnut washer on the flapper to exhaust pipe.

Did your concord come with a V8 originally???

Show us a picture.


Edited by Nor Cal CJ5 - Sep/23/2020 at 2:00pm
1972 CJ5 304 2 barrel 3 speed
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Sep/23/2020 at 8:31pm
Hey everyone... Sorry it took so long to get back here... It's been a heck of a day... Thanks for insight and info on the FelPro Gaskets. I tried to get under my car and take pictures... They didn't turn out really great but I don't have access to my jack right now... Anyway..  I can see what they did. They didn't have the right donuts and they must have used those thin gaskets by themselves. Unfortunately... They've just turned brittle and are falling apart in my hand. As far as the size goes... All I know is that my pipe is 2&1/4 and I'm using the standard free flow exhaust manifolds from a full size car. They are not the Rebel Machine version. So I think I need the 2 &1/4 version... Right? I'm not really sure though guys. 

Driver's side



Pass. side





This is a bad picture but you can see where the chunk fell off and that there's no donut in there.



NorCal... You are correct. My 82 Concord did not come with a V8. 1979 was the last year for a 304 in the Concord. I v8 swapped my car late last year with a 304 out of a 72 Javelin. The exhaust manifolds I'm using are the standard sized stock free flows from a full size car. They are not the Rebel Machine or the smaller late model small car version that had a log manifold on the pass. side. I had to clearance my strut rod bracket for it to fit on that side. For further details you can check out my build thread here.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/24/2020 at 7:18am
Fel pro says use the 2-1/8" which is what I have on my 72 manifolds.  However, like I mentioned they don't fit tightly and don't "snap" into the manifold like the old ones did and one side leaks ever so slightly at the manifold/donut interface I believe.  It appears the 2-1/8" donuts seal fine on the exhaust pipe side.  So I just ordered the 2-1/4" to see if they fit tighter into the manifold and help with that leak.  If the 2-1/4" don't fit the manifold then my plan is to go back to the 2-1/8" and use high temp copper RTV stuff between the manifold and the donut.  Honestly, I never had so much trouble with this sealing over the 30+ years I've had the car....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2020 at 3:50am
Don't get the Fel-Pro ones. They are made of a blue paper-like material that turns into powdery ash once it gets hot. Then it blows out and leaks. I've driven myself to the edge of insanity trying to keep them sealed. 

Get sintered graphite ones made by Walker. You can order them from any NAPA. Walker's part numbers are also NAPA's part numbers.

Walker/NAPA part number 31507. 

Exhaust gaskets went to crap when they stopped putting Asbestos in them. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote 390amx1 Quote  Post ReplyReply Direct Link To This Post Posted: Sep/25/2020 at 5:40am
The Fel Pro's I mentioned above are not blue whatever. They are 100% metallic and if I didn't know better would say they are a lead alloy with asbestos in them of some type.  Of course with todays regulations they aren't but they are definitely solid....
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