CJ5 401 Exhaust Manifolds same as a car? - JeepForum.com
 
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post #1 of 11 Old 10-08-2017, 01:32 PM Thread Starter
anton714
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CJ5 401 Exhaust Manifolds same as a car?

Howdie, fng here

Looking to replace my fenderwall headers with manifolds on my '78 CJ5 401.

My question is - are the exh. manifolds made for cars different than the ones used for Jeeps with the same motor?

I am trying to find a set of used ones to buy and would like to purchase the correct ones when I do.

Any info. greatly appreciated

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post #2 of 11 Old 10-08-2017, 02:03 PM
Matt1981CJ7
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Assuming your engine has the "dog-leg" ported heads (1970 and later), there are basically 2 varieties of V8 manifolds, rear-dump and center-dump.

You will need a rear-dump for the passenger side, and a center-dump for the driver's side in your CJ. Both versions came on a variety of different AMC cars and Jeeps. The manifolds on my 360 came from a AMX Javlin that had a 401.

Hope this helps,

Matt
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post #3 of 11 Old 10-08-2017, 08:55 PM Thread Starter
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Thanks Matt, very helpfull!

My 78 CJ5 I was told has an early 70's Wagoneer 401 in it. I can't really tell if they're dogleg ports or not with my headers still on. I'll try to post a few pics, maybe a trained eye can tell, my eyes are shot anyway.











Is there a number or code on the motor somewhere that tells what year it is?

Thanks for the pics also, they're great!
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post #4 of 11 Old 10-09-2017, 06:02 AM
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Quote:
Originally Posted by anton714 View Post
Is there a number or code on the motor somewhere that tells what year it is?

Thanks for the pics also, they're great!
No problem.

If your valve covers are original, there should be a stamped build tag on the front of the passenger side cover (see pic).

If so, go here to decode the numbers and determine when it was built.

Good luck,

Matt
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post #5 of 11 Old 10-09-2017, 09:42 AM Thread Starter
anton714
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Too cool, Thanks a bunch Matt. I found the tag "504Z11". From what I could decipher thanks to the link you supplied I have a 401 built on April 11, 1972.

Now I know what to buy, one's just like in your pic and make sure they're dog legged to match the ports and NO cracks. Is there a special place these usually crack to look for? I've heard they are prone to cracking.

I am supposed to meet someone tomorrow who has a set off a Javelin for 30 bucks.
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post #6 of 11 Old 10-09-2017, 09:51 AM
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I've never heard anything about them being prone to cracking, but I'd carefully inspect the ears where they bolt to the head. And lay them on a flat surface to make sure they aren't warped.

BTW, don't let a little rust dissuade you. Below are pics of what mine looked like when I got them, and how I restored them.

Good luck,

Matt
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post #7 of 11 Old 10-12-2017, 04:26 PM Thread Starter
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My meet with the guy got delayed, looks like today is when I'm gonna check out the manifolds he has.

Is the heat shroud easily removed and installed? He says the good manifold is missing the shroud but he has a shroud he will give me that's on another manifold.

Now I gotta fix my oven so I can make mine as purdy as yours turned out, great job!
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post #8 of 11 Old 10-12-2017, 07:25 PM
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I think the heat stove just rivets on, so replacing one shouldn't be too difficult.

LOL. I snuck the oven-baking in while the Warden was gone. Then lit a bunch of candles before she returned. I pulled it off, surprisingly. But, you can also bake the VHT paint by installing the manifolds, and let engine heat cure the paint. The instructions describe both methods, IIRC.

Good luck.

Matt


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post #9 of 11 Old 10-12-2017, 08:48 PM
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Ive seen more cracked sets than I have non cracked sets.......
I guess the age, heat cycles, expanding and contracting, makes for brittle cast iron....

Ed
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post #10 of 11 Old 10-12-2017, 09:33 PM Thread Starter
anton714
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Met the guy and bought these 2 for 30 bucks and he threw in a third that is cracked but has the heat shroud which is in bad shape.

Glad I got these though as they are the non smog style, no cracks I can see and not warped.



Thanks for all the info & help Matt

Your beautiful motor has got me all worked up now to clean mine up nice and get her going hopefully this spring. I have a few other important projects to do first so I'll just chip away at this a little at a time.
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post #11 of 11 Old 10-13-2017, 12:39 AM
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Those should work for you...and $30 is a great deal.

Do you have the factory air cleaner on your engine? If not, the heat stove won't be necessary. That stove connects to the snout of the factory air cleaner via a flexible hose. It supplies heated air to the carb while the engine warms up. It called the Thermostatically Controlled Air Cleaner (TAC) System.

You can see it in this pic.

Matt
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