YEAH!! My 390 ha no provision for ported vacuum. I plan to put a check valve in line this spring to help maintain full vacuum to the advance. My advance is set up to add timing as soon as the engine starts and idles. I can kill vacuum and raise the timing and three's no bog, but it makes it hard to start when the engine temp is on the hot side.
The engine in question is an old 153 cid. 4 cylinder out of a '67 Nova.
Never use a minor caliber bullet on a major caliber adversary
