If the 1bbl is working correctly,and set up correctly, and the engine is otherwise mechanically sound, then the engine will be as smooth as a six can be, with just 3 compression events per revolution.If they idle too slowly, they get to shaking, from the power pulses. Do not confuse this for a poorly set up carb. There is a reason the idle-timing on these old girls is TDC; the pulses are less severe. If you have cranked your timing up, the pulses will be earlier and stronger.
