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Edelbrock Single-Stage Power Valve Standard Flow 4 5 In Hg ZERO_PRICE Manufacturer Part # : XR0104MBZManufacturer Part # : 12645 Market Description The Edelbrock #12645 Single Stage 4. 5 Hg Power Valve operates by using engine vacuum to control the opening and closing rate. During heavy load or under full power situations, they open to supply additional fuel to the main system to eliminate hesitation and bogging, ensuring the smooth delivery of power without any drivability concerns. Key Search Words 12645; Edelbrock; power valve; holley; demon;