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258 header to 4.0 HO head |
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idrambler 
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Joined: Jul/02/2007 Location: Nampa,Idaho Status: Offline Points: 1368 |
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 Topic: 258 header to 4.0 HO headPosted: Dec/04/2007 at 3:17pm |
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has anyone modified car (Clifford) split 258 long tube exhaust headers to fit on a 4.0 HO head.....
Would like to use on a 258 to 4.0 HO head swap or on a 4.0 stroker build for a drag race engine..... Thanks, Edited by idrambler - Dec/04/2007 at 3:21pm |
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Jim..NAMDRA/AMCRC
Treasure Valley AMC Idaho http://idahoamcrambler.com/ 29Nash AMC360/904 69AMX 401/727 74Gremlin 401/727 73Matador/73Hornet wag |
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farna
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Posted: Dec/05/2007 at 11:23am |
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The ports are totally different on the 4.0L, especially the center two. On the 258 they are siamesed, separate on the 4.0L. You'd have to make a new flange for the 4.0L then cut the 258 flange off. Then you could bend the center tubes apart and reshape the ends before welding to the new flange. A bit of work, but you can take the 4.0L exhaust gasket to a shop that does plasma cutting and have them whip up a flange for you. Hope you're good at welding light gauge steel tubing though!
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Frank Swygert
American Motors Cars Magazine www.amc-mag.com |
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idrambler
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Posted: Dec/05/2007 at 12:14pm |
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Thanks...
I did not have a 4.0 gasket or head to look at....just in the thought process at present.... I am not a welder but I have a friend that is...he makes headers for his race engines all the time.... Edited by idrambler - Dec/05/2007 at 12:16pm |
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Jim..NAMDRA/AMCRC
Treasure Valley AMC Idaho http://idahoamcrambler.com/ 29Nash AMC360/904 69AMX 401/727 74Gremlin 401/727 73Matador/73Hornet wag |
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poormansMACHINE
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Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12357 |
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Posted: Dec/05/2007 at 4:09pm |
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I've got pics of the 2 gaskets stacked to see the difference. It'll have to wait til I get back home from this road trip Friday unfortunately.
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nosigma
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Joined: Dec/30/2007 Status: Offline Points: 188 |
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Posted: Dec/31/2007 at 4:56am |
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I did it and have not been happy with the results (exhaust leaks). See the post on shorty versus long tube headers for fabrication details. Perhaps a better machinist than I could cut a better set of stepped washers and get better results.
John
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rejeep
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Joined: Jan/12/2008 Location: New York Status: Offline Points: 8 |
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Posted: Jan/12/2008 at 12:15pm |
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wont work... tried.. have the old head and manifold if interested.
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nosigma
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Posted: Jan/12/2008 at 3:22pm |
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I just unpacked my new Clifford Performance dual outlet header. Its an unequal length (very unequal) short tube header and has terrible angles to the pipe as they come off the manifold face. I dont like throwing away horsepower so I am going back to my Cliffor Performance (the OLD company) long tube equal length pipe header with great tube angles and good radii that I converted for a 4.0 HO. Its going to be a lot of work to get it to seal up right but there is no way I am putting this thing on my engine unless I am absolutely backed into a corner. I will post up some pics comparing the two in the next couple of days and you will see what I mean.
John
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farna
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Posted: Jan/13/2008 at 10:57am |
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It's too bad that a company like Clifford has to trim back. I'm sure it's just not cost effective for them to stock so many headers and keep prices reasonable. The top seller is for a Jeep Cherokee (or CJ/Wrangler for the 258), so they make one that will fit that and keep the stock head pipe. That means it will fit just about any car as well, but the angles and tube lengths are less than ideal. Looks like they could offer the older designs (or similar new ones) on a special order basis, but that would cost a good deal more and mean a 4-6 week (or longer) wait. Unfortunately things like this is costing them business!
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Frank Swygert
American Motors Cars Magazine www.amc-mag.com |
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poormansMACHINE
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Posted: Jan/13/2008 at 11:02am |
How much business can they lose in the AMC, 6 cylinder passenger car specific market. |
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farna
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Posted: Jan/22/2008 at 3:38am |
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Good point!!
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Frank Swygert
American Motors Cars Magazine www.amc-mag.com |
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farna wrote: