Can anyone tell me what is supposed to be here?
That braided-covered hose with fitting on the end...

Just bought the truck and going through it.

1983 F250, 351ci
Holley 2bbl carb

 

That is a thermostatic hot water choke. The insulation is to help retain heat. Other models used a thermostatic hot air choke.

The brass fitting originally connected to the choke housing on the stock Motorcraft 2150 carburetor. The tubing routes into a water jacket that contains engine coolant. The hot water choke is designed to calibrate the opening of the choke plate by the temperature of the coolant. As the engine warms up, the coolant gets hotter and that heat gradually unwinds the spring inside the choke cap until the choke is fully open.

Aftermarket carburetors typically do not use thermostatic chokes. They usually have fully electric choke caps. That explains why yours is disconnected.

 

Thank you for the help. Does that explain why they installed a choke cable inside the cab for manual operation? Or is that for another reason...

 

their use of a choke cable inside is just the simple over used excuse of not knowing how to hook up an electric choke properly. Or maybe they feel electric chokes can open too fast and rather control it manually.

 

The open filter element isn't helping cold starts in any way.
It's no wonder they could not get an electric choke to function properly and "fixed" it by going to a cable.

BTW, that's a hot air choke.
You can see it coming from the lozenge shaped choke stove in the exhaust crossover of the intake manifold

 

I'm new to the carburetor world and am not familiar with electric chokes. Ease of installation? Possible with my Holley 2bbl?
And should I install the stock air intake/filter?

Still learning

 

You will like the factory-type of air cleaner setup if you live in a cold climate (and especially if you need to park outdoors).

Watch this video on adjusting electric chokes, it will at least give you an idea of what they are and how they work:

 

that is not hot water but hot air.

There is a loop of metal tubing that goes into the intakes exhaust cross over port to heat the loop.

The other end of the heating tube goes up to the stock air filter assy. To pull in clean air.
Dave - - - -

 

Which engines/models routed the hot air tube into the intake manifold? All of the ones I have seen routed the hot air tube to a chamber on the exhaust manifold.

I thought if the hot air tube bolted to the intake manifold, it was a hot water choke? Didn't some engines/models use engine coolant to heat up the hot air tube?

 

Im not certain about 335 series engines.
Gary Lewis or Chris could probably elaborate.

351 W's definitely had a choke stove in the exhaust crossover.
There wouldn't be any need for high temp fiberglass insulation if it were heated by coolant that (hopefully) never gets above 225*

A lot of engines used exhaust gas to heat the intake plenum floor.
This discourages puddling and helps vaporize fuel in cold weather.

 

IIRC those coiled-up things went into the exhaust stream used by the EGR stuff... had to have been that way on the 335 series as theose didn't have any sort of coolant crossover passages in the intake manifold, water flowed through the block & heads only.

 

I don't know what model that is on but I am 99.99% sure it is air that gets heater from the exh cross over that also heats the intake floor as was said.


AMC motors used that same hot air setup for the choke and also had a bracket held on with the 3 screws for the choke cover that held a heater hose next to the cover.
This would help heat the choke kind of like the low volt & hot air system Ford uses that I have seen posted about.




Hot air tube to choke on my AMC 360 – No it is not a Ford360!



Intake showing the choke heater unit installed



Don’t have any pictures of it all pretty and hooked up tocarb as I am still working on this car but it does work as the motor does run.
Dave ----