Bill D., no risk rupturing the diaphragm with full vacuum. I already applied that with a hand pump. I don't know the pros/cons of applying straight manifold vacuum to the advance. It sure isn't what Chrysler intended. I just mentioned that many Jeep owners do that, probably on their AMC 6 cyl motors. Seems like that would increase base timing (which you trim out) and retard timing at full throttle (good?).
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How much vacuum did you apply to it? Repeated exposure (such as might be experienced in the real world) to 20 inches might put a sensitive diaphragm (ported vauum style) at risk, I don't know.
Thanks for the information!!!
