5.9L Magnum Heads and headers (wont seal)
#529875
11/18/09 03:35 PM
11/18/09 03:35 PM
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Joined: Sep 2004
Posts: 2,093 oberlin, Ohio
Rapid340
OP
top fuel
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OP
top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Anyone know of a header that will seal well up against magnum exhaust ports? The Dynomax headers I had sealed fine up to an LA head (plenty of contact to machined area all the way around ex port) but the magnum exhaust port is raised and the bottom of the header flange opening barely overlaps the lower machined surface of a magnum head (under the exhaust port opening).
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: 5.9L Magnum Heads and headers (wont seal)
[Re: Rapid340]
#529877
11/18/09 05:14 PM
11/18/09 05:14 PM
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Joined: Oct 2003
Posts: 1,371 Costa Mesa, CA
chache876
pro stock
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pro stock
Joined: Oct 2003
Posts: 1,371
Costa Mesa, CA
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Quote:
Anyone know of a header that will seal well up against magnum exhaust ports? The Dynomax headers I had sealed fine up to an LA head (plenty of contact to machined area all the way around ex port) but the magnum exhaust port is raised and the bottom of the header flange opening barely overlaps the lower machined surface of a magnum head (under the exhaust port opening).
I have dynomax headers that were on my LA360 that I reused when I swapped over to 5.9 Magnum engine. They didn't seal the first time out so I tried some new gaskets but used high temp RTV this time around and they seal up just fine now.
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Re: 5.9L Magnum Heads and headers (wont seal)
[Re: chache876]
#529878
11/18/09 06:00 PM
11/18/09 06:00 PM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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summit long tube headers (I think they're flowtechs) seal up fine on my mag heads using copper RTV on the gaskets.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 5.9L Magnum Heads and headers (wont seal)
[Re: patrick]
#529879
11/18/09 06:51 PM
11/18/09 06:51 PM
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Joined: Sep 2004
Posts: 2,093 oberlin, Ohio
Rapid340
OP
top fuel
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OP
top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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My thinking is if the header flange seals fine on a magnum head, it may cover some of the lower part of the ports on an X or J head.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: 5.9L Magnum Heads and headers (wont seal)
[Re: Wedgeman]
#529883
11/19/09 11:50 PM
11/19/09 11:50 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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you are not imagining this problem! There is only about 3/16" common area comparing the bottom of the LA port to the bottom of the Magnum port.
you're looking at an LA gasket crushed against a Magnum port.
Last edited by GO_Fish; 11/19/09 11:52 PM.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: 5.9L Magnum Heads and headers (wont seal)
[Re: GO_Fish]
#529884
11/19/09 11:57 PM
11/19/09 11:57 PM
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Joined: Jul 2003
Posts: 6,167 Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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I made sheet metal adapters, outside dimensions of the LA port, and inside dimensions of the Magnum port. Sandwiched the adapters against the magnum port with LA gaskets between the adapter and the manifold (or header). These adapters along with a Remflex gasket solved my leaks.
Some report a hump on the Mag heads that stops the manifold from sitting flat, I did not see that in my case. The Remflex gaskets are good enough that they may still seal without the adapter plates.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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