How do I change from 4bbl to 2bbl carb on 1969 Ford F100

if you want to change it back from 4 barrell to a 2 barrell, you will have to drain the radiator and change the intake to a 2 barrell intake or get an adapter from a 4 barrell to a 2 barrell.

I think you're going to be surprised how little your fuel mileage changes. You wo not even notice it.

Two ways.

You could use a 2 barrel carburetor adapter plate on ur current intake manifold.

You could replace the 4 barrel intake manifold with a 2 barrel manifold.

If setup correctly, the 4 barrel will get the same or better fuel mileage, as long as u use a light touch on the throttle. This is because the engine is normally running on the primary barrels, these r usually smaller then the barrels used on a 2 barrel carburetor. The secondaries (all 4 barrels) r not opened until the engine is placed under a load (heavy foot on the throttle). The secondaries r operated by engine vacuum & only open as much & as long as the engine demand requires.

You can buy an adapter plate. Much easier than changing the manifold.

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You will have to buy a 2bbl carb and manifold. Then you will have to change manifolds and carbs and readjust the linkage. probably.

You would need to oreder a 2barrel intake manifold then put the 2 barrel carb on top of that.

you need a 2 barrel intake, a 2 barrel carburetor and intake and carburetor gaskets and whatever linkage might be necessary and tools/manual.