401 EXHAUST MANIFOLDS OR HEADERS NEEDED!

[dooghssr]

I have a 74 AMC 401 in my CJ. My current headers are too long for my new trans. I need some shorty headers or stock exhaust manifolds. Where would be the best place to find these? Thanks

[tufcj]

Bone yards. The right manifold is the same on all AMC cars, trucks, and Wagoneers (except the Pacer) from 1971-1991, You need a left from 1971-1985 (about) with the outlet in the middle. The later ones had the outlet at the back, and will hit the firewall on a CJ.

All exhaust manifolds are the same from 304-401, so whatever you find will work. You can find some 1971-1974 truck manifolds that aren't drilled for the air tubes.

I see them pop up on ebay quite often. You can even get new repros, but they are about $150 each.

Bob
tufcj

[dooghssr]

that is what I keep seeing. The stock are as much as headers if purchased new. What about the Edlebrock shorty headers, from Summit. About $360 for the full kit (bolts, gaskets, etc).

[dooghssr]

I picked up a set of stock exhaust manifolds w/air. I don't want to use the air. I believe they are 9/16 threads, but seem loose. The 14mmn doesn't fit. Is 9/16 threads correct. Also I need the bolts to install them. Does anyone know the size bolts I will need for the manifold install.

[Dusty]

heat em up in the ovena nd weld up that hole

[tufcj]

I plugged a set with Allen head pipe plugs. They are a little loose, but the hole has a lip at the bottom. I covered the threads with high temp RTV (Permatex copper) and ran them in till they bottomed. Never leaked. I suppose a couple of spot welds could also be used.

Bob
tufcj

[dooghssr]

I found the correct 9/16 bolts and used some copper RTV and just bottomed them out at about 25 ft lbs. I get the exhaust put on next Friday and will finally run it to see what happens. Thanks for the help on this.