WHICH HEADER

[Flash]

the exhaust ports for 00-01 head are actually smaller than 91-99, redesigned for lower emissions. The smaller ports constricted exhaust flow to lower NOX emissions, and the intake manifold was redesigned to compensate for the resulting loss of horsepower that came from the smaller exhaust ports..

The APN would bolt on, but the exhaust ports wouldn't match the insides of the header tubes exactly. Not really worth the experiment.

The split exhaust manifold is probably superior to any aftermarket one piece, tri-y header, simply because this split exhaust manifold design does'nt crack.

The irony is, the 00-01 model years split exhaust might BE the reason 0331 heads crack. Both from more uneven heating of the head and the bulkier, heat-trapping intake manifold above it. But that's just my theory...

Thanks for the insight

NO th irony is that the head finaly didn't crank but THE HEADS DO!:shocked:

 

[joecool]

From the last couple posts, it sounds like the split exhaust manifold would be the way to go since they don't crack. So out of curiosity would a set of Clifford exhaust headers with a y-pipe be a better setup? Would I have to start worrying about cracked heads, especially if I decided to do a 99+ intake manifold swap at the same time?

 

[Flash]

Thanks for the insight

NO th irony is that the head finaly didn't crank but THE HEADS DO!:shocked:

first of let me rephrase the previous statement:twak: :twak: :twak: :twak:

The irony is that the headER don't crack on the 99.5 up, but the head will :wierd:


I really don't think that the header is what is causing the heads to crack(just a poorly design head around the valves and the coolant that runs under them.

To more directly answer your question,... no the 99 and "up" manifolds (int, or ext,) is not the problem its the head!


Flash.

 

[Adam96]

So, just to get this straight because I just received my APN yesterday...header wrap is not a good idea? I got some because a friend was bragging it up about how much it will reduce underhood temps yada yada yada. He has it on his suburban and told me that it promotes rust on the header IF you don't coat the entire thing with silicone spray after putting on the wrap. Does this sound right to anybody?

 

[workaholic]

So, just to get this straight because I just received my APN yesterday...header wrap is not a good idea? I got some because a friend was bragging it up about how much it will reduce underhood temps yada yada yada. He has it on his suburban and told me that it promotes rust on the header IF you don't coat the entire thing with silicone spray after putting on the wrap. Does this sound right to anybody?

Regardless of what you do header wrap will promote rust and cracking. The shear design of it is what does it. It is designed to keep heat inside of the wrap and let it out, thus heat soaking the metal that the header is made of and promoting cracking. Rust is promoted becauase of what the wrap is made of, a porous fabric basically which holds water. If you are looking to reduce under hood temps get it ceramic coated. IMHO that is the only thing that should ever be used to coat/wrap a header of any variety.

Tom

 

[Flash]

So, just to get this straight because I just received my PAN yesterday...header wrap is not a good idea? I got some because a friend was bragging it up about how much it will reduce under hood temps Ada Ada Ada. He has it on his suburban and told me that it promotes rust on the header IF you don't coat the entire thing with silicone spray after putting on the wrap. Does this sound right to anybody?

I will say this: if you are detriment to use the header rap then get some High temp paint and put many coat on it to seal the header rap from moisture.....now you have to cure the pain by starting it from a minute at a time and then letting it cool(if your putting this on a fresh eng or cam install you CAN NOT DO cure the head) it will require many low heat soaked to keep it from burning the paint off.

"This will not keep a header from cracking." have already rapped my cuda headers and had bought some to do my jeep...........but from every thing that i have read here, i thing i will try something diff with the jeep.

Flash.

 

[Bones]

My nephew works for Borla, and he told me they haven't gotten a return on a header for any jeep product with a crack for as long as he has been there (about three years) some that were obvoiusly in accidents and crushed, but not heat or a vibration related crack. So have the guy send in the one you saw. They have a lifetime replacement warrenty.

Show him these pictures:

Cracked Borla header pics

The only reason they aren't getting this one back is I can't find the receipt.

Bones :skull1:

 

[CartsXJ]

Show him these pictures:

Cracked Borla header pics

The only reason they aren't getting this one back is I can't find the receipt.

Bones :skull1:

Well I returned two of them in a single year and finally sold my last "new replacement" that was still in the box and went with a clifford long-tube set-up.

 

[Weasel]

I've read various parts of this and just got off the phone with the guys at clifford. He didn't seem to think having the ports in different places(H.O. vs Renix) would matter. He said it will work fine.

I do have a concern though about fitting all that pipe down alongside the engine, seem like the stock one gets hit enough as is.

 

[Flash]

I've read various parts of this and just got off the phone with the guys at clifford. He didn't seem to think having the ports in different places(H.O. vs Renix) would matter. He said it will work fine.

I do have a concern though about fitting all that pipe down alongside the engine, seem like the stock one gets hit enough as is.

???????????????? I think that you need call them back up and ask to speak to some one els!!!!!!!!!!!
Renix and HO are different headers!!!!!!!!!! It may only be the EGR port on it but i know that they are different.


Flash.

 

[nick88xj]

would any one know if the header that flyngphl showed fit a 88 xj

 

[Flash]

would any one know if the header that flyngphl showed fit a 88 xj

How about a link!:dunno:

flash

 

[Weasel]

???????????????? I think that you need call them back up and ask to speak to some one els!!!!!!!!!!!
Renix and HO are different headers!!!!!!!!!! It may only be the EGR port on it but i know that they are different.


Flash.

Well I'm getting conflicting information. Clifford and someone else has said the intake ports were moved NOT the exhaust ports. The other two say that the exhaust ports have been moved.

http://www.naxja.org/forum/showthread.php?t=909244

 

[Flash]

OK please under stand that i don't have any gospel truth on any of this by in the last 6 months this is what i have got out of it!

Renix has and EGR so you can't us any newer manifold because that don't us and EGR(and extra tube that comes of of one of the header pipes.) and is why most header manufactures say 92+.......this much i know for positive!

I do believe the because of the way the intake manifold is shaped, you would have to do some grinding on the intake and ex/header to make it not bind.I

I do believe that the early HO(92-95) and later HO(96+) can be interchanged between each other,...Exceped that the the 96+ had has a twin exit and all the rest have a 6 tube into 1 !

Comment!!!!!!
Straighten me out were i my be Confused


Flash.

 

[Onkover]

My 2 years old banks cracks, now I'm looking for a replacement, not shure about borla, I bought the borla cat back system and isn't 2.25" (is about 2" and 1.75" at the joints), I found a banks style header but made of 304 SS insted of 409 for $300.00 (is easy to find welding rods for 304 than 409).

Must have got the wrong cat back. I have Barla cat back and mine not only measured properly but bolted up real easy... other then the final bend in the tail pipe. I had to cut the end off and welf on a straight tube to compinsate for my rear drop shackles and a different rear bumper.

 

[Flash]

Must have got the wrong cat back. I have Barla cat back and mine not only measured properly but bolted up real easy... other then the final bend in the tail pipe. I had to cut the end off and welf on a straight tube to compinsate for my rear drop shackles and a different rear bumper.

APN header Dos any one have a link, did a searh but the links i found were not there any more?

 

[Weasel]

Yes that does sound correct, except some of us don't need ot care about thEGR, otherwisew you can have a bung welded in.

 

[Flash]

Yes that does sound correct, except some of us don't need ot care about thEGR, otherwisew you can have a bung welded in.

Yes you can have a EGR tube welded in to a newer one,92+, for a renix But, as i under stan it the shape of the renix manifold(intake) is what causes the bind or interference with the header.

the newer header on a renix requires the early HO intake manifold to go with it.......I thing there is more then the EGR to causes problem.

Sorry i keep looking at it from the renix point of view!:looney:

I'm beginning to thing that my split of years(HOs) in not quit accurate either!

cents like 98 there is a spit to or was that when the twin header came out?

Flash.

 

[Harlee&Tahoe]

Yes you can have a EGR tube welded in to a newer one,92+, for a renix But, as i under stan it the shape of the renix manifold(intake) is what causes the bind or interference with the header.

the newer header on a renix requires the early HO intake manifold to go with it.......I thing there is more then the EGR to causes problem.

Sorry i keep looking at it from the renix point of view!:looney:

I'm beginning to thing that my split of years(HOs) in not quit accurate either!

cents like 98 there is a spit to or was that when the twin header came out?

Flash.

mid 97???
renix 87-90
HO began in 91 right?

 

[Flash]

mid 97???
renix 87-90
HO began in 91 right?

Yes should have put 91+ for HO

I think that the HOs were 91-95...96 brought somthing new and then 98 there was some kind of change and then late 99 up had the head that cracked and the low pinion dana 30?????

some one els should real post up here cause after 90.... my knolage is not so sharp :variety: :idea:

Flash