Rochester Quadrajet Carburetor Air Valve Shaft
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This tab located on the secondary air-valve shaft is used to restrict airflow in applications where maximum capacity isn't needed. A slight amount of material can be removed to increase airflow capacity for high-performance engines that require additional airflow. In these instances, the rear portion of the secondary air valves should open 80-90 degrees from its resting position, which should yield a maximum secondary-airflow capacity of roughly 600 cfm. View Related Article
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