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Re: Question for all those on manifold vacuum
Typically, vacuum advance at idle is a good thing. Keeps things burning clean and lowers operating temp. There's no load on engine so pretty hard to have too much if your total isn't too much to begin with. As you give it throttle the load increases and vacuum decreases the timing as mechanical advance comes in. Longhair is 100%.
The Summit can adjust for limit and this in a very small way may effect initial curve but not much.
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