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Old 10-11-2012, 03:03 PM
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FYI: The manifold vacuum has nothing to do with the opening of the secondary air valve or vacuum secondary in a Holley carbs. What causes the secondary to open is the air traveling threw the venturi in a carb. Manifold vacuum drops down to almost zero when the throttle is at WOT. Secondary open on demand when the motor needs it.

Last edited by lg1969; 10-11-2012 at 03:08 PM.
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