Holley Pro Series Double Pumper Carburetor Secondary Linkage Kit # HO20-122 Rate_20 Valve springs are one of

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Holley Pro Series Double Pumper Carburetor Secondary Linkage Kit # HO20-122 Rate_20 Valve springs are one ofThrottle Linkage, Secondary, Natural, Steel, Holley, 4500 4500 HP 4150 4150 HP, Kit Holley Pro Series secondary linkage kits will provide a bulletproof method of adjusting secondaries on all double pumper, HP, and Ultra HP Holley carburetors. You can choose between a 1: 1 ratio and progressive secondary linkage operation. Their unique design provides infinite adjustment of the carburetor's secondary throttle blades, which makes for easier tuning