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Old 03-20-2010, 08:59 PM
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Machanical advance does not work at idle, it`s only use is off idle, centrifical force is what advances it. Connect the vacuum advance to a full time manifold vacuum port, one that pulls vacuum even at idle. Since you already had 12 degrees base timing, the vac advance will add another 10 to 12 degrees depending. After you connect it, recheck the base timing, it should be 20-24 degrees.
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