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Though Holley supplies a base gasket we had to use a thicker insulated gasket to raise the Street Avenger enough to enable the fast idle set screw to clear the intake manifold at wide-open throttle. Weiand manifolds have a groove machined into them to eliminate this problem, but on stock intakes and some other aftermarket manifolds, including the Edelbrock Performer, there can be a slight clearance issue. View Related Article
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