258/4.0 L head : which header ? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-17-2002, 02:35 PM Thread Starter
 
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258/4.0 L head : which header ?


I want to do the 4.0 L head swap on my 258.
I heard the 4.0 L exhaust manifold is prompt to crack quite easily.
So which header fits best a 258/4.0 L head in an 83 CJ 7 ? (with A/C or brake booster)

Thanks for your help

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post #2 of (permalink) Old 02-17-2002, 07:09 PM
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Re: 258/4.0 L head : which header ?

use the 4.0 i & e. i think people have been saying '98
and up were the non crackers.
or do the aftermarket thing for the ex.


when in doubt.........
empty the magazine.
post #3 of (permalink) Old 02-17-2002, 08:40 PM
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Re: 258/4.0 L head : which header ?

Go with a single outlet header like Pacesetter has, I have a dual outlet one and there is not alot of room on the driverside of the frame rail. Also I have separate dual exhaust, if I were you I'd go with 1 muffler that has two outlets like a Flowmaster if you were wanting to go to duals. They sound good, but man they take up WAY to much room.

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post #4 of (permalink) Old 02-17-2002, 11:06 PM
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Re: 258/4.0 L head : which header ?

Just my two cents, since BustedRig brought up pacesetter. I think pacesetter products are JUNK. But like I said, it's just my opinion(from learing it the hard way).

"Every form of refuge has it's price."
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post #5 of (permalink) Old 02-18-2002, 12:06 AM
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Re: 258/4.0 L head : which header ?

For what it is worth, the early 4.0 headers were a simpler (much less prone to cracking) design.

Here is a pic of mine that came from an 89 cherokee (I've seen them on commanches as well):





-raymo
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post #6 of (permalink) Old 02-18-2002, 01:31 AM Thread Starter
 
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Re: 258/4.0 L head : which header ?

That sounds like a good and affordable way to go.
Does it fit right in the CJ ? (no trimming required)

Thanks

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post #7 of (permalink) Old 02-18-2002, 12:02 PM
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Re: 258/4.0 L head : which header ?

Raymo, I have that same stock manifold in my basement. It's cracked it 3 places. Thats how I found out about Pace Setters poor quality. I foolishly replaced the cracked stocker with the cheapest header I could find. IMO post 91 style manifolds are less prone to cracking.

"Every form of refuge has it's price."
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post #8 of (permalink) Old 02-19-2002, 10:30 PM
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Re: 258/4.0 L head : which header ?

I didn't say go with Pacesetter, I said go with the one outlet design. I cann't commment on Pacesetter's quality my header's are from Dynamax...anyway they may be junk I don't care anymore, I'm making way for a 360.

waiting on the 1-tons!
post #9 of (permalink) Old 02-20-2002, 02:10 AM
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Re: 258/4.0 L head : which header ?

Andytron,

Here's why I recommend the earlier 4.0 design header. When I was looking for a 4.0 header I found one off a '93 wrangler that was cracked. I took it to a machine shop that welds headers regularly. I found out that they do all of the machine/welding work for one of San Diego's larger Jeep dealers. The welder told me he welds 3-5 of the mid 90s style headers EACH WEEK. They always crack where the two tubes finally come into one.

So, off I went to the junk yard and found the header pictured above. When I took it to the shop (when I was picking up the head from a valve job) to ask if this was any better/worse, he said simply said 'tons stronger'.

When I found the one above, I picked through 4 or 5 of the other style that were each cracked (or broken through) at the same place.

For what it's worth, and it fit with no interference in my CJ..plenty of room all around it. I did have a new tube bent to go between the header and cat.

-raymo
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post #10 of (permalink) Old 02-20-2002, 04:23 PM
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Re: 258/4.0 L head : which header ?

Thats supprising. In my neck of the woods all the 87-90 4.0's are the ones with the cracked manifolds. I'll have to keep my ears open while im around later model Jeeps from now on.

"Every form of refuge has it's price."
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