Rusty is correct.
Jon offers a major rebuilding kit, which includes the correct main metering jet, the correct vacuum piston spring, and other non-normally found parts for all of the Rochester type B carburetors; assuming the customer has the tag number. Basically, if one does not have the tag number on the Rochester B, one has a door-stop. And then suggests that if you want better performance to switch to a Carter.
Shucks Jerry, I even make kits for Holleys
Mr. Dane - Jerry is probably correct about the power valve being open all of the time. It could be a sticking piston, or the infamous warped carburetor body that is a trademark of the Rochester B. With today's fuel, a carburetor with original calibration THAT IS FUNCTIONING NORMALLY, is much more likely to be lean rather than rich. Changing main jets to a leaner calibration is generally not the answer for the Rochester B.
Suggested superior alternatives: Carter, Stromberg, Zenith, or if one has the hood removed, a 15-year old lad standing on the running board pouring gas into the engine from a leaky boot!
Jon.
