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Product Description This single-stage standard flow power valve boosts your vehicle's power when pulling heavy loads or at fast speeds. By enhancing the carburetor's response to vacuum forces, the power valve allows an optimal amount of fuel through the carburetor for increased torque and higher speeds. The power valve will open when the engine reaches a vacuum of 3.5 Hg. It has a 90-day warranty for defects in material and workmanship. From the Manufacturer A key component of the power enrichment system of Holley performance carburetors, this Single-Stage High Flow Power Valve boosts your vehicle's power when pulling heavy loads or going really fast. By enhancing your carburetor's response to vacuum forces, the Holley power valve allows an optimal amount of fuel through the carburetor for increased torque and higher speeds. Each Holley power valve is stamped with a number to indicate its vacuum opening point. For example, the number"65" indicates that the power valve will open when the engine vacuum drops to 6.5" Hg, or below. An accurate vacuum gauge, such as Holley P/N 26-501, should be used when determining the correct power valve to use. Holley Performance Products, Inc. products are warranted to be free from defects in material and workmanship for a period of 90 days from the date of purchase. FEATURES Quality power valve for enhanced power enrichment when pulling heavy loads or going fast Eliminates hesitation and bogging for better performance Gasket included for easy installation Helps time carburetor operation for specific fuel usage requirements Number indicates vacuum opening point for specific fuel needs What's in the Box Single-Stage High Flow Power Valve