I am trying to determine which of the two carbs I have pictured would be the correct one to rebuild for my project. It is a 77 f100 stepside 302 auto with ac. It currently has a Edelbrock 4 barrel with a manual choke. It runs great but I want to go back to what it should have. I only see one wire is required for each carb, but they appear to go to different places on the carb. I believe they are both 2150's. Both carbs ay "Remanufactured" on them but I will make sure they are rebuilt prior to installation.




The first two pictures came from a 1977 F150 with a 351.








The second two pictures are from a 76 F250 351.

 

Well, the differences between the 2 is the top one has an electric idle stop thingy, the second one has an electric choke. They both appear to be set up for an automatic. Not sure what the electric idle stop thingy is for, I am sure some smog crap. They look to be pretty much the same other wise. I would probably use the best parts from both. I would do a complete tear down of both. Soak them in some good penetrating fluid. Use the pieces that have the least amount of rust and pitting for your rebuild. Electric idle stop I would ditch, as far as whether you use the electric choke or not is up to you. I believe it just needs a 12v ignition wire.

Of course, I would just stick with the 4 barrel myself.

 

Thanks for the reply.


I just did some research on the "thingy" and came up with something that might tell me I need it because of the ac. I got this on line somewhere.


"A vacuum kicker is a linear vacuum motor that uses a manifold vacuum signal to open the throttle plates slightly upon high-vacuum deceleration to reduce excess HC emissions.
Solenoids allow throttle position to be changed by an electric signal. They can be used with air conditioning (A/C) to increase the idle speed when the A/C compressor clutch engages. They can also be used as “anti-dieseling” devices, allowing the throttle plates to close farther than the curb idle position when the ignition is switched off.
Solenoids can be combined with either a dashpot or a vacuum kicker, depending on the application.
With a solenoid throttle positioner, you set the curb idle with the solenoid in its “normal” position while the engine is running. In the case of an A/C solenoid, you set curb idle with the solenoid de-energized. In the case of an anti-dieseling solenoid, you set the curb idle with the solenoid energized."


If I use this, where does the power feed come from?