Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - how much vacuum for secondary's
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Old 09-16-2010, 07:00 PM
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You can check for secondary opening by putting a paperclip on the secondary arm (rear passenger side), drive the car, as the secondaries open the arm moves and the paperclip moves. Search YouTube for the holley video showing how it's done. Secondaries won't open in park.
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