Re: Vacuum advance not working?
Seems like if the vacuum is hooked up to the right place on the carb, and the idle is nice and low, say less than 800, you should notice no difference with vac advance hooked or not. If you do, the vacuum advance is set waaay too low, or broken. In other words, you shouldn't have enough vacuum to be pulling the vacuum advance open (providing vacuum advance) AT ALL when idling. Vacuum advance adds spark/timing advance, in addition to the distributor's mechanical advance, throughout the power band, in direct relationship to throttle position, based on the vacuum condition inside the carb/intake.
1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350
I do all my own stunts.