I have a 1956 Chevy truck with a Rochester single Barr. carb. I have rebuilt it twice & have made sure the float is adjusted properly. It has a new Distributor with 1700 miles. It bogs down very bad when you push down on the accl. hard & fast. You can roll it off normal & it runs great. When you test drive it, it bucks like a horse unless you baby it. I did notice after rebuild when you push the accl. pump down fuel comes out of the hole where the T-hold down is on the large steel ball. I don't know if this is normal or not. I have two b type Rochester's & both do this. Can anyone help me with this problem?
Welcome aboard the forums, time to get an other carb and stop practicing on your nerves. Got photos of your ride? Look at my threads on the 47 to 55 forum and you will see the address of a shop that is good, you may even call them to see what it is you are doing to cause the problem. I had the same issue and it stopped when I exchanged the carb. Good Luck, Charles
Flat Spots First thing , go back in and check your valve gaps as tight valves mean lousy off idle throttle response . Then check the timing b, @ idle it should be ball on pointer viewed in the little window just above the flywheel . When you open the throttle , the *instant* it begins to move , there must be a healthy squirt of fuel out the discharge tube in the carby . Lots of different reasons why not : wrong size . missing check ball in the bottom on the accelerator pump well , well to rough to allow a good seal of the accel. pump plunger's seal , the seal roper is worn out or improperly installed so the lip is flipped at the edge . Once some guys couldn't get the brandy new leather plunger in the well and so trimmed off the leather with a razor blade then whiled when it had terrible flat spots . I fixed it in 5 minutes ,they thought Me a genius , I thought them mentally challenged . Look close and hard .
