Chevy Carburetor Tuning Tips - Dial In Your Carb
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Unlike a Holley that actuates its secondaries based on throttle angle or engine vacuum, a sprung air flap covers the secondaries on Carters and Q-jets. The flap opens when air speed overcomes the tensioning of the springs. On a Carter, the rate at which it opens can be adjusted by rotating the tensioner clockwise to speed it up, or counterclockwise to slow it down. A spring change accomplishes the same thing on a Q-jet. View Related Article
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