Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - vacuum secondary or douple pumper
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Old 01-29-2013, 02:16 PM
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them opening sooner really isn't going to change a lot, it'll help some, but it'll be very slight. I would also look into properly tuning your PV circuit, its the most overlooked and one of the most important. your high load tuning should be done with this circuit NOT the jets as is so often done.
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