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Vacuum Advance - Manifold or Ported
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01-14-2007, 02:54 PM
mr0077
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Join Date: Jul 2000
Location: Las Vegas, NV
Cobra Make, Engine: ERA 427 SO
Posts: 1,126
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The higher the vacuum, the more the spring is compressed and more vacuum advance is added...when the vacuum drops, the spring extends and takes out advance.
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