Header swap (true or false)??? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Header swap (true or false)???

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy Aluminum BumpersThe RuffStuff "I can't go to EJS" Sale!

Reply
Unread 07-05-2013, 09:26 PM   #1
JayRay08
Registered User
1996 ZJ 
 
Join Date: Jun 2013
Location: tucson, az
Posts: 80
Header swap (true or false)???

I read somewhere that a good exhaust header swap as an upgrade to the 318 5.2 v8 zj would be headers from 92-93 dodge trucks, vans, dakotas as well as the 93 ZJ. anyone have knowledge of this? would this be a good cheap upgrade if pulled from a salvage yard??

JayRay08 is offline   Reply With Quote
Unread 07-05-2013, 09:28 PM   #2
dnuccio
Registered User
1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,474
no. any exhaust manifold from a full size dodge anything is going to dump straight into the "frame" rail of the ZJ.
__________________
Reliability is relative
R.I.P. Ratmonkey
dnuccio is offline   Reply With Quote
Unread 07-05-2013, 09:57 PM   #3
JayRay08
Registered User
1996 ZJ 
 
Join Date: Jun 2013
Location: tucson, az
Posts: 80
Ok so the only upgrade to the exhaust would be a new cat and a performance muffler. This is my first time messing with exhaust. Would i want 2.5 inch pipe from the manifold to the cat? Would that also mean i am looking for a 2.5 inch inlet and outlet for the cat and muffler? sorry for the noob question.
JayRay08 is offline   Reply With Quote
Unread 07-05-2013, 10:21 PM   #4
Mickey_D
Registered User
1997 ZJ 
 
Join Date: Aug 2008
Location: 40° 3'42.36"N 112° 2'16.73"W, Utah
Posts: 6,685
Talk to Kolak. He's a member on here as well as one hell of a vendor.
__________________
1997 ZJ 5.2 Orvis, Baby!
1953 Willys M100 trailer Tagalong
________________
[_][][][][][][][][_]


Mickey_D is offline   Reply With Quote
Unread 07-06-2013, 09:16 AM   #5
HighLonesome
Belief In All Things Jeep
 
HighLonesome's Avatar
1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
Posts: 5,057
Some stock 93 ZJ V8 exhaust manifolds are supposed to flow better. I have no idea how to spot them or how much better they are. speedfreaks.net has some info.
HighLonesome is offline   Reply With Quote
Unread 07-06-2013, 09:27 AM   #6
Pierre_r
Member
 
Pierre_r's Avatar
1989 XJ Cherokee 
 
Join Date: Jul 2009
Location: Sweden
Posts: 490
I bought the doug thorley headers from kolak.
They are a litte pricey but if you want to go 3" all the way they are worth it according to all of those who have them on their jeeps. + they look much nicer than the stock manifolds...
Pierre_r is offline   Reply With Quote
Unread 07-31-2013, 08:36 PM   #7
JayRay08
Registered User
1996 ZJ 
 
Join Date: Jun 2013
Location: tucson, az
Posts: 80
any thoughts on these http://www.jegs.com/i/Hedman/500/785...d=#moreDetails
or another brand that wold work well?
JayRay08 is offline   Reply With Quote
Unread 07-31-2013, 08:53 PM   #8
dnuccio
Registered User
1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,474
you cant just find headers for a 318/360. they need to be specifically designed for a ZJ. most if not all aftermarket headers (that arent designed specifically for the ZJ) dump right into the ZJs frame rail
__________________
Reliability is relative
R.I.P. Ratmonkey
dnuccio is offline   Reply With Quote
Unread 07-31-2013, 08:57 PM   #9
JayRay08
Registered User
1996 ZJ 
 
Join Date: Jun 2013
Location: tucson, az
Posts: 80
I was reading thru ratmonkeys thread and thought he had used those..
JayRay08 is offline   Reply With Quote
Unread 07-31-2013, 09:00 PM   #10
dnuccio
Registered User
1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix, AZ
Posts: 3,474
he mightve. i dont know for sure
__________________
Reliability is relative
R.I.P. Ratmonkey
dnuccio is offline   Reply With Quote
Unread 07-31-2013, 10:11 PM   #11
newfieZJ
Jeep Collector
 
newfieZJ's Avatar
1995 ZJ 
 
Join Date: May 2008
Location: , Alberta
Posts: 6,271
Quote:
Originally Posted by JayRay08 View Post
I was reading thru ratmonkeys thread and thought he had used those..
He did but had no choice . His trans swap was from a Dodge putting the starter on the driver's side . This was his only option and if Kolak sold out the last batch of Thorley's , our only option .

With them , comes the fabrication of the y-pipe . Can get pricey if you can't do it yourself

I have headers and love them , but , from now on , I will have to be content with making a new y-pipe with 2.5 pipe and no crush on the pass side (tight) . Supposedly , removing the crushed pipe adds approx 10 hp alone , probably 10+ more with bigger y-pipe . That will be close to header capability .

Biggest gain comes from a new cat and muffler . 2.5" works fine unless you have headers or modify the y-pipe .

IIRC , the 93's had a larger outlet on the manifold .25" bigger . Early production only . Hard to spot like you said HL , hard to find period .
newfieZJ is offline   Reply With Quote
Unread 07-31-2013, 10:15 PM   #12
StPaul59
Registered User
1998 ZJ 
 
Join Date: Mar 2013
Location: St Paul, MN
Posts: 277
Some Dakota shorty headers will work. Ratmonkey was using them I think.
StPaul59 is offline   Reply With Quote
Unread 08-01-2013, 09:21 AM   #13
JayRay08
Registered User
1996 ZJ 
 
Join Date: Jun 2013
Location: tucson, az
Posts: 80
thanks for clarifying that newfieZJ. Ive read people throwing around edelbrock having some but I haven't found em yet. do you know if they still make them and if so can you link it here?
JayRay08 is offline   Reply With Quote
Unread 08-01-2013, 09:31 AM   #14
newfieZJ
Jeep Collector
 
newfieZJ's Avatar
1995 ZJ 
 
Join Date: May 2008
Location: , Alberta
Posts: 6,271
Edlebrock stopped making the some time ago . I have them , they are very good . No issues since the install . only a 2.5 collector but they work well . I got them for $250 delivered to my door under a 1/2 hour , 2nd hand but new . Guy needed some $$$

Post 26 has a pic of the complete Edlbrock kit
http://www.jeepforum.com/forum/f197/...86/index2.html
newfieZJ is offline   Reply With Quote
Unread 08-01-2013, 10:52 AM   #15
CatSplat
Derp.
 
CatSplat's Avatar
1994 ZJ 
 
Join Date: Jul 2009
Location: Calgary, Alberta
Posts: 1,126
Quote:
Originally Posted by StPaul59 View Post
Some Dakota shorty headers will work. Ratmonkey was using them I think.
IIRC he had to notch his frame to make those ones fit.
__________________
1994 5.9L ZJ, retrofitted UC package, NP242 swap, 17" JK Moabs with 32" BFG MT KM's.
The Jeep of Theseus
CatSplat is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.