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258 headers

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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 8:06am
You can make a flange for the 258 and weld on 4.0L headers. The ports on a 258 are larger than the tubes on the 4.0L header though, that causes some turbulence in the port if just bolted on. Would be better to make a transition piece between the rectangular and round tubes sort of funnel shaped, or inserts in the ports (harder to do). Another difference is that the center ports on the 258 are siamesed together, the 4.0L separated. Even 258 headers have two separate tubes, merging the two center tubes won't be that hard.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 8:17am
so just suck it up and buy the Clifford  lol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote javelinman74 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 9:22am
I do have a factory tube exhaust manifold, new that I bought years back in thinking that I would do the 4.0 head swap, and of course it's still on the shelf ready to go to a good home to be used, I'll never do it.  $75 + ship
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ollie Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 10:51am
If you buy Clifford headers, be prepared to do additional welding on them.

They gave me a rough time.

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Ollie
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 11:39am
what kind of extra welding ?  i do not have a welder 
72 matador 401 the beast
79 concord 2 door
72 matador 304 grasshopper
68 Rogue 406
93 Cherokee 4.0 5 speed

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ollie Quote  Post ReplyReply Direct Link To This Post Posted: Aug/13/2018 at 3:40pm
Originally posted by matty 401 matty 401 wrote:

what kind of extra welding ?  i do not have a welder 


I purchased a complete 258 package from Lying Larry Clifford. Headers, intake and carbs.

The intake manifold did not have the final machining done on it. I had to cut all the mounting bolt holes myself.

The carbs would not work with Lokar linkage that I needed for my 727 trans. I was told it would all work. I took one heck of a cut and returned the carbs.

The exhaust headers were totally sub-standardly built. As if they were not even lined in the jig when built. I had to build up weld twice on the face surfaces and file by hand to get them to seal properly. The ports did not and still don't line up properly.

Tell Lying Larry to keep his gasket, it will not work. Buy your own Rem-flex gasket, the only fighting chance you will have.

I am trying to go easy on Lying Larry and his junk. I have had a few years to calm down. Do business with him at your own risk.

Here are some pics from my project page...pg 19 & 20

Header pics

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Ollie



Edited by Ollie - Aug/14/2018 at 9:05am
1966 American Convertible -- "The Rambler"..SOLD
1974 Postal Jeep -- "Rapid Delivery"...SOLD
1969 Rambler 220 post car--"Road Warrior"
1989 Jeep Comanche Pioneer, 4.0L, auto, 2wd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 5spdwagon Quote  Post ReplyReply Direct Link To This Post Posted: Aug/18/2018 at 4:42am
Originally posted by Ollie Ollie wrote:

If you buy Clifford headers, be prepared to do additional welding on them.

They gave me a rough time.

Having AMC Fun,
Ollie

This is why I kept my orginal manifold
Real hot rods have 3 pedals
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/18/2018 at 8:20am
i have a factory aluminum intake and the matching exhaust manifold off a 81 concord  but the intake is missing the heating element on the bottom  so a large open hole is there  lol
72 matador 401 the beast
79 concord 2 door
72 matador 304 grasshopper
68 Rogue 406
93 Cherokee 4.0 5 speed

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farna View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Aug/18/2018 at 8:03pm
You can bolt a plate over the hole, just make sure it's sealed good.  I always recommend considering a 4.0L head swap if you want a header. You get a good valve cover and a factory header.  You can use an aluminum 258 carb intake. You won't get much of a performance boost with just a head swap, but you do get a newer head and the better valve over and exhaust header. ANY 4.0L head, even the 87-90 Renix, is better than ANY 258 head. Ports are smaller on all the 4.0L head, but flow better due to being a better shape.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty 401 Quote  Post ReplyReply Direct Link To This Post Posted: Aug/18/2018 at 8:08pm
car has 70 thousand miles  just do not want to pull it that far apart  if going that far will put a complete 4.0  maybe a 4.6 stroker in it 

Edited by matty 401 - Aug/18/2018 at 8:44pm
72 matador 401 the beast
79 concord 2 door
72 matador 304 grasshopper
68 Rogue 406
93 Cherokee 4.0 5 speed

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