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When you suck on the hose it should retard the timing. It should NOT advance under pressure. What is called 'vacuum advance' is actually 'vacuum retard'. So it's NOT pressure TO the distributor, it's vacuum in the intake manifold to create retard. So blowing into the hose is useless, as it should be.
You get retard by vacuum in the intake manifold. Boost does not impact ignition timing in a distributor-equipped car. Advance is provided by engine speed.
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