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Unread 02-09-2015, 08:15 PM   #1
superduty06
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1989 YJ Wrangler 
 
Join Date: Feb 2013
Location: pendleton, oregon
Posts: 14
exhaust headers

will the 4.0 exhaust fit the 4.2 or the 4.2 fit the 4.0? I would like to put a exhaust header on my 4.2 hard to fined headers that fits 4.2s can fined a lot of them for a 4.0.

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Unread 02-09-2015, 08:36 PM   #2
88_olympic
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I do not believe The header from a 4.2 258 will not fit the 4.0 motor. The intake and exhaust ports on a 258 are all even with each other. On a 4.0 the intake and exhaust are staggered. I think you will run into fitment issues if you tried to swap.
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Unread 02-10-2015, 06:17 AM   #3
Mike Romain
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Posts: 15,681
Nope, different designed head. The intakes will swap with a little tweak, but not the exhaust.
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Unread 02-10-2015, 07:56 AM   #4
Rebel442
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Dont know why you cant find 4.2 headers there are several brands out there from budget to high end. Off the top of my head Borla, Hedman, Pacesetter, and Clifford all make them.
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Unread 02-18-2015, 07:15 PM   #5
bergovoy
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1990 YJ Wrangler 
 
Join Date: Nov 2014
Location: San Gabriel, California
Posts: 364
the OP is correct. not a lot of options for the older YJ exhaust manifold/header.

morris4x4 has the ONLY one I have found so far....

if anyone has other options, please let me know...

btw, I'm california and need the O2 bung.. thanks


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Unread 02-18-2015, 07:42 PM   #6
Rebel442
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1989 YJ Wrangler 
 
Join Date: Jul 2008
Location: Chicago
Posts: 632
Borla
http://www.borla.com/products/wrangl...rt__17062.html
This one is installed on my '89 auto trans

PaceSetter
Uncoated
http://pacesetterexhaust.com/87-90-j...r-headers.aspx
Coated
http://pacesetterexhaust.com/87-90-j...d-headers.aspx

Clifford
http://www.cliffordperformance.net/M...gory_Code=J258
Not sure of an O2 bung on this one. Any decent shop can weld one in for a reasonable fee.

Looks like I was wrong about Hedman.

4.2l CJ headers will fit, However there may be some fitment issues with intake manifold thickness(spacers), O2 bungs(easy to add), EGR valves(eliminate), carb heat risers(eliminate) , pulse air systems(eliminate), and auto trans linkage clearance issues. If you have tough visual emissions issues they may not be for you.
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Unread 02-18-2015, 07:45 PM   #7
synwill
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Borla makes one and they are based in California. Just make sure that the EO number that is stamped on the header matches your year. I installed mine and then the smog station said it was the wrong EO for my year so I had to have Borla send me the correct EO and then I had to tack weld it on after installing. Pain in the rear.
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Unread 02-18-2015, 10:17 PM   #8
bergovoy
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1990 YJ Wrangler 
 
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Location: San Gabriel, California
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yea, I actually found those previously and forgot about them... I was surprised that hooker and hedman didnt have anything... and a few others... not sure why...

and yea, the bung can be added but it will get shot down by the visual inspection... as will the pulse air system... Ive heard they don't care about the hot air riser and carb choke isnt as much of an issue, (as we are in sunny so california... )

thanks for posting the links btw...
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