Where does OEM exhaust manifolds dump on '80-'81 CJ7 with 304 and AT? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 11-08-1999, 06:36 PM Thread Starter
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Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

I'm in the planning stages of a 360 swap and I need to know where the exhaust manifolds dump (center or back) on a '80-'81 CJ7 with a 304 and and automatic transmission? Also, anyone have a source for the "Y" pipe?

Thanks in advance,

Jeeper2

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post #2 of (permalink) Old 11-08-1999, 07:14 PM
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

[img]/wwwthreads_images/icons/smile.gif[/img] Our '79 304 dumps out the back on both banks of cylinders.....crosses under just ahead of the flywheel, and joins up on the left. Ours is not a stock setup, so I actually do not know what the wye pipe is supposed to look like. This one is all 2-1/2", and I SUSPECT it has been increased from 2". There is also a heat riser on the right bank.[img]/wwwthreads_images/icons/tongue.gif[/img]

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post #3 of (permalink) Old 11-08-1999, 07:29 PM
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

I just had dual exhaust put on my 76 CJ/304 after swapping in a T-18(old y-pipe wouldn't fit). I have the y-pipe in my garage it is in great shape. I originally had a t-150 3 speed so if the height of the Auto trans is close to that, but less than the height of the T-18 it should fit. I have to check to see if my manifolds dump down( I think so). The exhaust then went to the drivers side just left of the Trans/t-case and exited out the drivers side back. It looked like a stock set up to me.

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post #4 of (permalink) Old 11-09-1999, 08:15 PM
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

on my 80 w/ a 304 and tf tranny the exhaust exits in differnt locations on each side. on the drivers side it exits under about the 3rd cylinder back, but on the pass side it exits much further back about 8-10 inches past the end of the block, when the y pipe was replaced I was able to get one from some little mom & pop parts store, but it did take a while 7-10 days, and while I was waiting I decedied to have one custom made a by midas. Its kind of a weird setup just about every other v'ed engine i've seen the headers exit in the same spot, excpet for the transvesly mounted engine in my mom's van

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80 CJ-7 Laredo 304v8 TF999 3.73's BFG M/T's
post #5 of (permalink) Old 11-09-1999, 11:43 PM
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

[img]/wwwthreads_images/icons/blush.gif[/img] Yeah Markey....you ARE right...I just looked at these manifolds sitting here and the LH side comes out between the last two cylinders, and as you mentioned, the RH side sweeps back a long way past the block.[img]/wwwthreads_images/icons/blush.gif[/img]

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post #6 of (permalink) Old 11-10-1999, 12:57 PM Thread Starter
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

Thanks for all the help guys [img]/wwwthreads_images/icons/smile.gif[/img] I knew someone would know the answer.




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post #7 of (permalink) Old 11-10-1999, 04:40 PM
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

woah, me right? (I cheated, I went out and looked at it)

-MarkyMark
80 CJ-7 Laredo 304v8 TF999 3.73's BFG M/T's
post #8 of (permalink) Old 11-11-1999, 02:42 PM Thread Starter
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Re: Where does OEM exhaust manifolds dump on \'80-\'81 CJ7 with 304 and AT?

If anyone happens to still be following this post... the 360 I have is (supposedly) from a 1985 GW.

The left manifold dumps between the 3rd and 4th cylinder, but closer to the 4th.

The right manifold has a heat riser (like CJDave said) and exits about four to five inches behind the 4th cylinder.

I'm thinking that this setup will be workable for clearance based on what MarkyMark says, although I will need a custom "Y" pipe (thinking 2 1/4" here) will need to be made. No biggie, since OEM is not available.

Thanks for the feedback,

John

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