The Stovebolt Site Forums The Shop Area Engine Shop Carbking..carb question

I have a 46 chevy one ton truck. Stock rebuilt 54 Chevy 235 with rebuilt Rochester carburetor. Guessing that rear end is low-mid 3:00's-changed out before me.

Running a 5 speed overdrive trans from a 1954 REO truck. Over drive ratio is approximately .8/1. Truck will run 55-60? (no speedo gear on trans) comfortably on the interstate at 2500-2800 rpm.

Carb has been rebuilt several times. Orig carb had 'rochester sticking float blues'. Changed carb from my 235 spare motor.

Truck runs well. Judging by plugs, engine is running consistently rich. Also, base of carb is generally wet. (I have a Carter YF carb, but the linkage setup is completely reversed from the Rochester and I can't figure how to set up).

Is there a more modern carburetor from a later Chevy engine which would bolt up and provide better service and mileage? If Carter YF is ticket, do you have a source for the proper throttle linkage.

Truck is weekly driver, used for material hauling from Winston-Salem, North Carolina to Galax, Virginia. Most miles are highway miles.

Thanks for your help.

Are you running the right gasket in the base to allow the power valve to see manifold vacuum?

Also, what is your manifold vacuum running down the road? You might have low enough vacuum that the power valve stays open and runs rich.

With 3.0somethng gears and overdrive I would expect you to be more in the 1800 rpm range at 55 mph unless your tires are really small.

Several threads on this forum concerning the power valve, which as mentioned by 4onthefloor, could well be the problem. Wrong gasket or body warpage can cause power valve problems.

Carter built LOTS of different YF carbs. There is another thread on this forum which lists the YF's which are applicable to Chevrolet engines.

Stromberg and Zenith are other options, and from a quality standpoint, even better than the YF; but the correct ones tend to be pricey.

Jon.