Quote Originally Posted by canadianal
riddle me this does the gm vacume advance and mechanical advance all add up together to determine total advance.
or does the vacume advance pull advance out at low vacume full throttle aplications.
i was going to get a advance tape to put on my harmonic balancer but i dont have one or at least on a caddy motor anything that looks like one.


Total advance is initial plus mechanical. Vaccum advance drops under acceleration unless you use port vaccum then it raises up to WOT then drops.