426 Hemi exh manifold to headpipe ball flange question? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer 426 Hemi exh manifold to headpipe ball flange question?

Print Thread

426 Hemi exh manifold to headpipe ball flange question? #1115594 11/17/11 04:46 PM 11/17/11 04:46 PM
Joined: Jan 2003 Posts: 4,105 Horsham, Pa. Finoke OP master
Finoke OP master Joined: Jan 2003 Posts: 4,105 Horsham, Pa.	I'm getting ready to install the OEM exhaust system in my 70 Challenger and have a question about the connection between the exhaust manifolds and the head pipes. Should the ball flange have a gasket on the inside diameter of the exhaust manifolds? I bought the manifolds as a used repo set and they have a round composite ring type gasket stuffed in both exhaust manifold outlets. Should I be using them? Its been so long that I'm missing one. But maybe I don't need them? 6923983-CIMG0519.jpg (100 downloads)

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: Finoke] #1115595 11/17/11 04:55 PM 11/17/11 04:55 PM
Joined: May 2005 Posts: 6,446 NJ-USA H HPMike master
HPMike master H Joined: May 2005 Posts: 6,446 NJ-USA	Quote: I'm getting ready to install the OEM exhaust system in my 70 Challenger and have a question about the connection between the exhaust manifolds and the head pipes. Should the ball flange have a gasket on the inside diameter of the exhaust manifolds? I bought the manifolds as a used repo set and they have a round composite ring type gasket stuffed in both exhaust manifold outlets. Should I be using them? Its been so long that I'm missing one. But maybe I don't need them? Nope.. The pipe has a taper which mates with the rounded outlet end of the manifold.. Which headpipes are yo using? MB

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: HPMike] #1115596 11/17/11 05:49 PM 11/17/11 05:49 PM
Joined: Jan 2003 Posts: 4,105 Horsham, Pa. Finoke OP master
Finoke OP master Joined: Jan 2003 Posts: 4,105 Horsham, Pa.	Thanks Mike, that's what I thought. I'm using the accurate exhaust system. Tom

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: Finoke] #1115597 06/13/12 11:46 AM 06/13/12 11:46 AM
Joined: Jan 2003 Posts: 4,105 Horsham, Pa. Finoke OP master
Finoke OP master Joined: Jan 2003 Posts: 4,105 Horsham, Pa.	My exhaust manifold to head pipe flanges continue to leak a little. I was gonna go back in and insert the round gasket that was on the exhaust manifolds when I got them. The only thing is, I can only find the one. Does anybody make a ring gasket for the ball and socket type exhaust flanges. I know your not supposed to need a gasket, but my connection seems to leak no matter how much I tighten.

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: Finoke] #1115598 06/13/12 12:17 PM 06/13/12 12:17 PM
Joined: Jan 2003 Posts: 75,026 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,026 U.S.S.A.	I've never seen a gasket on a ball and socket flange . Take what you have to the auto parts store and see what they can come up with that looks similar . I have a repop set of hemi manifolds and I don't remember seeing a gasket with them. Have you tried sealing the joint with hi temp red rtv ?

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: JohnRR] #1115599 06/13/12 01:25 PM 06/13/12 01:25 PM
Joined: Jun 2003 Posts: 21,442 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,442 It's a dry heat	Due to the design of how the pipe seals ( it has to flex there ) to the manifold , a gasket is not going to last long.

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: gtx6970] #1115600 06/13/12 01:56 PM 06/13/12 01:56 PM
Joined: Oct 2003 Posts: 1,795 BC Canada O ogopogo top fuel
ogopogo top fuel O Joined: Oct 2003 Posts: 1,795 BC Canada	I had to spend some time on my manifold flanges grinding casting irregularities off or they would have never sealed,did you inspect yours before install?

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: ogopogo] #1115601 06/13/12 02:36 PM 06/13/12 02:36 PM
Joined: Jan 2003 Posts: 4,105 Horsham, Pa. Finoke OP master
Finoke OP master Joined: Jan 2003 Posts: 4,105 Horsham, Pa.	Good replies, I'll try to post a picture later of the gasket that came with the manifolds. I havn't thought to try high heat RTV. I also never thought to inspect for irregularity or burrs. Nows the time since I pulled the heads due to a sticking valve. I'll post later with what I find.

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: Finoke] #1115602 06/13/12 08:47 PM 06/13/12 08:47 PM
Joined: Mar 2005 Posts: 1,022 Green Lane, PA sawdust super stock
sawdust super stock Joined: Mar 2005 Posts: 1,022 Green Lane, PA	The tapered flange of the cast iron manifold for the original and reproduction manifolds seals with the bell mouth of the H-Pipe (no gaskets), unless someone ground the taper off your manifolds. Another key thing is the reproduction manifolds have to be dressed up as the flange area was not machined to remove the casting lines. If your manifolds were not "Modified" and still have the tapered flange you need to dress the taper to remove the casting lines. Just some experience talking with repro parts, see casting line in picture, it leaked, of course. My 2� 7249282-flangecastingline.jpg (72 downloads)

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: sawdust] #1115603 06/14/12 10:34 AM 06/14/12 10:34 AM
Joined: Nov 2003 Posts: 1,029 Southeast Virginia 68jim super stock
68jim super stock Joined: Nov 2003 Posts: 1,029 Southeast Virginia	I had a buddy with the exact same issue using the repro manifolds. He found an aerosol can cap that was the same size and used it as a template along with a file to knock down the high spots and casting flash. No more leaks. He said the file work probably took longer than a die grinder but he had more control and less chance of making a mistake. Good luck!

Re: 426 Hemi exh manifold to headpipe ball flange question? [Re: sawdust] #1115604 06/16/12 12:50 PM 06/16/12 12:50 PM
Joined: Jan 2003 Posts: 4,105 Horsham, Pa. Finoke OP master
Finoke OP master Joined: Jan 2003 Posts: 4,105 Horsham, Pa.	Quote: The tapered flange of the cast iron manifold for the original and reproduction manifolds seals with the bell mouth of the H-Pipe (no gaskets), unless someone ground the taper off your manifolds. Another key thing is the reproduction manifolds have to be dressed up as the flange area was not machined to remove the casting lines. If your manifolds were not "Modified" and still have the tapered flange you need to dress the taper to remove the casting lines. Just some experience talking with repro parts, see casting line in picture, it leaked, of course. My 2� Yes, this is the case. Looks like I will be breaking out the die grinder. Thanks

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1