Base Timing Questions

MV8 said
Rick,

Using vacuum advance with full manifold vacuum direct from the intake instead of ported vacuum through the carb is not normal. This is initial throttle tip in from 1000 rpm or so, off-idle. With soft enough advance weight springs, it could start working at that low an rpm to counter the loss of vacuum advance, but it was just a quick check to see how it acts. I switched back to "normal" typical operation which is ported vac or not using the vac advance. Normal vacuum advance function is part throttle/low load at higher rpm where airflow is much greater than at idle and less critical.

I understand where you're coming from, but MVA does more than that. It also provides additional timing when vacuum is high while cruising. Ported VA was something the mfr's did for emissions, not performance. Your engine could certainly be tuned to allow for MVA, and you would likely gain MPG's while cruising. My point was that it is not normal for the engine to stall like you mentioned due to timing swing.