k i have a 89 cherokee 4.0L and the exhaust manifold is cracked i wanna put a performance one on instead of a stock one but on the headers some say the year starts at a 84 cherokee and some say they start at 91 cherokee whats the difference will a 91 part not work on a 89 if you could help at all it would be great thanx
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whats the difference between a 89 and a 91 jeep cherokee
- Thread starter deejay
- Start date
knuckleuppunk
NAXJA Forum User
- Location
- SoCal HiDes
The intake ports are higher on the '91 and up heads, so that is the concern (gasket wise). The exhaust ports on all 4.0L engines are in the same spot. What that means is that you can use any year 4.0L header and mount it to your 4.0L head, but you'll need to get the correct gasket for your year cylinder head, etc... (hi port or low port).
- Location
- Roanoke VA
The 89 is a RENIX and will have the EGR tube connection on the manifold. The 91 is OBD1 and does not have the EGR
- Location
- Roanoke VA
The "official" answer to that is to keep all emissions controls intact.:nono:
However if you need to "test"
something you could plug something temporarily.
The fitting on the EGR bung is a odd size if I remember correctly. 5-90, Old Man or Ecomike could chime in with better info on the fitting
However if you need to "test"
something you could plug something temporarily. The fitting on the EGR bung is a odd size if I remember correctly. 5-90, Old Man or Ecomike could chime in with better info on the fitting
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Can you weld?
If not, any muffler shop can weld on a bung for the EGR tube.
One issue that may surface with using a 91+ on a 90 and earlier is that the downpipe may not line up with the header's collector. This is no real problem, as any muffler shop can make a new downpipe, or (better) is that you cut and add in a section of stainless steel flexpipe before the CAT. That may give you enough flex to connect the downpipe to the header, and has the main benefit of reducing the stress on the header that causes them to crack in the first place.
lil_red_wagon
NAXJA Forum User
- Location
- hot springs ar
can anyone else verify this to be true? are all the mounting points the same? so if i get a 91 header i can use it on my 90 with a 90 exhaust/intake mani gasket?
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
True.
lil_red_wagon
NAXJA Forum User
- Location
- hot springs ar
ok cool thanx for the info. and to the OP wasnt tryin to take over you thread. i have bein lookin for a header for my jeep. was wonderin if the only diff was the egr bung i can get passed that.
magimerlin
NAXJA Forum User
- Location
- Flatonia, Tx
The "official" answer to that is to keep all emissions controls intact.:nono:
However if you need to "test"
The fitting on the EGR bung is a odd size if I remember correctly. 5-90, Old Man or Ecomike could chime in with better info on the fitting
I have been "Testing" the egr tube not being hooked up for about a year.. lol
The then new Dorman replacement exhaust manifold wouldn't let it screw back in right. The holes where about a 1/2" off. So I figured lets see how it works with out it. I guess I am still checking. It passed Houston,Tx emissions last time with flying colors though.
knuckleuppunk
NAXJA Forum User
- Location
- SoCal HiDes
I was the GM over at Clifford before Jack Clifford passed away in 2001. I did many head conversions and stroker kits during my time there. I don't know suspension, but I do know the 4.0L. Ha!
Thanks for backing up the new kid on the forum, I appreciate it.
- Location
- Roanoke VA
Good to have you on here and your knowledge. I used some Clifford stuff on my 300 I-6 that I built for a 84 F-150. It would light up all 4 tires on the street and sounded like a V-8. I had the 4 barrel intake and split headers and went with a Sig Erson cam.
6=8
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
knuckleuppunk
NAXJA Forum User
- Location
- SoCal HiDes
Thanks for the warm welcome - I'm already loving it here.
I love the Ford 300 L6! I swapped one of those into a '66 Stang years ago. That thing ran too!
You know that Sig's brother used to grind all of my cams at Clifford, right? Babe Erson did all of our profiles, that is why they ran so damn good. R.I.P. Babe!
Right is right! Welcome to. :cheers:
Thank you!
knuckleuppunk
NAXJA Forum User
- Location
- SoCal HiDes
Great! Glad we could help.
- Location
- Rainy side of Washington
op can you please start using punctuation this is the second thread i have seen from you with no punctuation and it makes my brain turn off when i do not see punctuation thus i find it very hard to give you a lucid useful answer so please use punctuation maybe this post will show you how much more difficult it is to read a post without punctuation but then again maybe it wont and holy run on sentence batman oops
- Location
- Roanoke VA
:roflmao::lecture: I think we need to start a "On Line" English and Punctuation class on here. My 3rd grade English teacher use to beat me and put me in the corner for misspelled words and poor punctuation. After a few beatings I learned to get it right.
knuckleuppunk
NAXJA Forum User
- Location
- SoCal HiDes
Back to the corner for you. :kissyou:
- Location
- Roanoke VA
eace: I just hope Mrs Beasley isn't on our forum :eyes: That dang yard stick hurt:bawl:Similar threads
