Hey group,
I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...
I need to find a header that will be compatible with this swap. Has anyone
out there done this swap and, if so, which header or manifold did you use.
I've read Tim Weavers article on the swap but info on the exhaust set up is
pretty vague and not really applicable to my 1984 model. (Bill, if you could
step in here it would be greatly appreciated!) Thanks in advance for any and
all replies...
Charles

81 DJ5L
84 CJ7
92 Cherokee

 

This just a Guess, but the difference is the relocation of the
smaller intake ports on the four liter, and that the exhaust ports are
in the same position, making it possible to bolt your old cast iron on.
But why not buy the newer tuned tube headers?
http://www.1aauto.com/1A/ExhaustManifolds/Jeep/CJ7
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...
> I need to find a header that will be compatible with this swap. Has anyone
> out there done this swap and, if so, which header or manifold did you use.
> I've read Tim Weavers article on the swap but info on the exhaust set up is
> pretty vague and not really applicable to my 1984 model. (Bill, if you could
> step in here it would be greatly appreciated!) Thanks in advance for any and
> all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee

 

This just a Guess, but the difference is the relocation of the
smaller intake ports on the four liter, and that the exhaust ports are
in the same position, making it possible to bolt your old cast iron on.
But why not buy the newer tuned tube headers?
http://www.1aauto.com/1A/ExhaustManifolds/Jeep/CJ7
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...
> I need to find a header that will be compatible with this swap. Has anyone
> out there done this swap and, if so, which header or manifold did you use.
> I've read Tim Weavers article on the swap but info on the exhaust set up is
> pretty vague and not really applicable to my 1984 model. (Bill, if you could
> step in here it would be greatly appreciated!) Thanks in advance for any and
> all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee

 

This just a Guess, but the difference is the relocation of the
smaller intake ports on the four liter, and that the exhaust ports are
in the same position, making it possible to bolt your old cast iron on.
But why not buy the newer tuned tube headers?
http://www.1aauto.com/1A/ExhaustManifolds/Jeep/CJ7
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...
> I need to find a header that will be compatible with this swap. Has anyone
> out there done this swap and, if so, which header or manifold did you use.
> I've read Tim Weavers article on the swap but info on the exhaust set up is
> pretty vague and not really applicable to my 1984 model. (Bill, if you could
> step in here it would be greatly appreciated!) Thanks in advance for any and
> all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee

 

This just a Guess, but the difference is the relocation of the
smaller intake ports on the four liter, and that the exhaust ports are
in the same position, making it possible to bolt your old cast iron on.
But why not buy the newer tuned tube headers?
http://www.1aauto.com/1A/ExhaustManifolds/Jeep/CJ7
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...
> I need to find a header that will be compatible with this swap. Has anyone
> out there done this swap and, if so, which header or manifold did you use.
> I've read Tim Weavers article on the swap but info on the exhaust set up is
> pretty vague and not really applicable to my 1984 model. (Bill, if you could
> step in here it would be greatly appreciated!) Thanks in advance for any and
> all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee

 

I would think you could just buy an aftermarket 4.0 header and install that.

Carl


"Ervin Charles" <charleserv@charter.net> wrote in message
news:DX5Rf.671$ts.643@fe05.lga...
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play
> toy... I need to find a header that will be compatible with this swap. Has
> anyone out there done this swap and, if so, which header or manifold did
> you use. I've read Tim Weavers article on the swap but info on the exhaust
> set up is pretty vague and not really applicable to my 1984 model. (Bill,
> if you could step in here it would be greatly appreciated!) Thanks in
> advance for any and all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee
>

 

I would think you could just buy an aftermarket 4.0 header and install that.

Carl


"Ervin Charles" <charleserv@charter.net> wrote in message
news:DX5Rf.671$ts.643@fe05.lga...
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play
> toy... I need to find a header that will be compatible with this swap. Has
> anyone out there done this swap and, if so, which header or manifold did
> you use. I've read Tim Weavers article on the swap but info on the exhaust
> set up is pretty vague and not really applicable to my 1984 model. (Bill,
> if you could step in here it would be greatly appreciated!) Thanks in
> advance for any and all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee
>

 

I would think you could just buy an aftermarket 4.0 header and install that.

Carl


"Ervin Charles" <charleserv@charter.net> wrote in message
news:DX5Rf.671$ts.643@fe05.lga...
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play
> toy... I need to find a header that will be compatible with this swap. Has
> anyone out there done this swap and, if so, which header or manifold did
> you use. I've read Tim Weavers article on the swap but info on the exhaust
> set up is pretty vague and not really applicable to my 1984 model. (Bill,
> if you could step in here it would be greatly appreciated!) Thanks in
> advance for any and all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee
>

 

I would think you could just buy an aftermarket 4.0 header and install that.

Carl


"Ervin Charles" <charleserv@charter.net> wrote in message
news:DX5Rf.671$ts.643@fe05.lga...
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play
> toy... I need to find a header that will be compatible with this swap. Has
> anyone out there done this swap and, if so, which header or manifold did
> you use. I've read Tim Weavers article on the swap but info on the exhaust
> set up is pretty vague and not really applicable to my 1984 model. (Bill,
> if you could step in here it would be greatly appreciated!) Thanks in
> advance for any and all replies...
> Charles
>
> 81 DJ5L
> 84 CJ7
> 92 Cherokee
>

 

Ervin Charles wrote:
> Hey group,
> I have ordered a 4.0 head to go on my 84 CJ7 4.2, Manual Trans play toy...

You need a 4.0 header, the cheapest are on ebay Stainless steel for
around 50 bucks, these are just direct rip offs of OEM tube header with
the accourdian flange to eliminate the cracking problem on the long tubes.

You then need welding skills or a muffler shop to do your collector
pipe, your old one more than likely wont be even close to the header's
output. The 4.0 collector pipe (or "down pipe") is on the wrong side and
routed differently from the YJ and most likely the CJ.

--
Simon
"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein