The Stovebolt Site Forums The Shop Area Engine Shop 235 hesitating

First don't assume your "new" carb is correct. If it is a Reman chances are about 1 in 4 that it is right. If it is a NOS it probably has been in storage many years & parts have dried up. If it is a salvage carb sprayed off with carb cleaner, who know's. First look down the throat of the carb with the engine shut off. Work the throttle from a closed position. You should see a squirt of gas go in the throat each time. If not or it is just a dribble, the accel pump is weak. If it is good try advancing the timing a little. You can do it at the octane selecter. Loosen the holdown bolt & turn the dist. CCW about two notches. You can check your vacuum advance by watching the dist as you accel the engine. The dist should turn when you rev up the engine. If that work's you will need to go into the carb. The float level could be wrong or the main jet might not be the right size for your engine. The fact that it starts & idles good is a real plus.