351M choke question

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Jan 26, 2005 | 02:50 PM

blueoval65

Thread Starter

Mountain Pass

Joined: Jan 2005

Posts: 112

Likes: 1

From: East Tennessee

351M choke question

I put a rebuilt carb with auto. choke on my 78 351M 4x4. I'm trying to figure out how to hook up the choke housing to the engine so it will open and close. I've heard a couple different stories on how they are supposed to be installed. I've been told they work off temperature from the block, intake, and exhaust manifolds. Which (if any) of these are true. If it's the exhaust, my truck has headers, so what option does that leave me? Where can I get some detailed information (with pictures if possible) for this install?
Thanks everyone.

Later

Jan 26, 2005 | 03:26 PM

kc5hwb

Tuned

Joined: Mar 2004

Posts: 454

Likes: 0

I don't know as much about it as I should, but I had that automatic choke on my old motor and it never worked worth a darn. It is suppossed to work off the heat/vacuum from the intake manifold, but I never could get mine to run right. I was glad when I got rid of it and got a 4BBL carb with electric choke.

Jan 27, 2005 | 04:08 PM

bubbaf250

Posting Guru

Joined: Aug 2000

Posts: 1,127

Likes: 3

From: (near) Denver USA

If the choke housing on the side of the carburetor has a flare fitting pointing down (and slightly to the rear), it should be connected to a heat exchanger coil located inside the intake manifold's exhaust crossover.

The following pic shows what the heat exchanger looks like installed on the OEM manifold, and the tube that connects the choke to the heat exchanger.

If the choke thermostat has an electrical spade terminal, it should be connected to a wire from the alternator's stator terminal.

Check out this page for more info about the choke:

http://home.earthlink.net/~bubbaf250...b/carb02a.html