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4.0 header to 232/258 swap ? (Read 909 times)
JYDtoo
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4.0 header to 232/258 swap ?
05/05/09 at 01:45:43
 
I think I have seen this discused somewhere, but can't find it. Can't get the factory manifold to seal on my 232....might have access to a 4.0 tubular manifold. What modifications will this take? I know the head pipe won't hook up, that's not a problem. What does it take to mount it to the motor?
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garryjav
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Re: 4.0 header to 232/258 swap ?
Reply #1 - 05/06/09 at 00:50:45
 
the port spacing is not the same, if your a good fabber you can make it work. i know a guy that took a 258 header and welded it to a 4.0 flange so i would think you could go the other way too, or split the 4.0 flange and heat it to fit the 258 head then weld in some stock to make  it stay that way but by the time you did all that you could work some ot or do a side job and buy a 258 header
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Garry
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Re: 4.0 header to 232/258 swap ?
Reply #2 - 05/06/09 at 00:51:56
 
oh and why won't it seal?
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Garry
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JYDtoo
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Re: 4.0 header to 232/258 swap ?
Reply #3 - 05/06/09 at 02:21:17
 
warped and corroded on every surface. Run too long leaking with no gasket. I know it didn't have an exhaust gasket from the factory, but this one had one at one time, then the intake gasket was replaced, exhaust gasket was not installed......but part of the previous replacement exh gasket was left on the head. I even followed the torque sequence when I replaced gaskets.        Besides, the "header" looks cool
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JYDtoo
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Re: 4.0 header to 232/258 swap ?
Reply #4 - 05/09/09 at 02:42:49
 
Nobody interested in helping a dumb azz?
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garryjav
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Re: 4.0 header to 232/258 swap ?
Reply #5 - 05/10/09 at 01:11:59
 
what car do you have? and have you thought of doing the 4.0 head swap? aslo you could try running a bead of high heat silicone around each port and see if that works. i would put it on and let it get about half hard then bolt it on and let it cure at least overnight
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Garry
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nosigma
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Re: 4.0 header to 232/258 swap ?
Reply #6 - 05/14/09 at 01:29:57
 
I think I am guy that garryjav mentioned about putting the 258 header on the 4.0 head.  I strongly suggest NOT doing this unless you have some good fab skills and patience.  The only reason I went to this extreme (258 header on a 4.0 Head) is that I wanted the old syle Clifford dual output long primary headers to go with the motor I built (over built?) and, garryjav, had a set that fit the Rambler chassis.  I spent many days getting the fit up initially.  Dummy head, lots of cutting, bending and welding.  I used a 4.0 flange and after getting everything close I sistered it to the modified 258 flange, welded up all the internal and external gaps then ported the whole thing.  To bolt it up I machined stepped washers since they clamp both the exhaust and the intake to the head and the exhaust flange was now twice as thick as the intake.  
 
I leaked.  I eventually had to take it off and carefully surface it using a belt sander, 220 paper and a polished mirrored surface to check flatness across all six ports simultaneously.  It works great now, no leaks and lots of power.
 
Unless you have an insane desire to torture yourself over a long period of time go the simple route, put on a 4.0 head and a 4.0 Header.  BTW dont buy a Clifford header.  I ordered and returned two of them, one dual and one single outlet in a fit of frustration with the one I was building.  Then bends, kinks and workmanship sucked.  
 
Clifford does offer a great intake/exhaust gasket, thick, relatively soft and very durable.
 
John
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