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Holley 125-45 - Holley Power Valves

Holley 125-45 - Holley Power Valves
Holley 125-45 - Holley Power Valves

JEGS Part Number: 510-125-45

Single-Stage Standard Flow Power Valve
Opening Vacuum: 4.5'' Hg.
    $9.69 Ships

Holley 125-45 Details

Single-Stage Standard Flow Power Valves

  • Includes Gasket
  • Opening Vacuum 10.5 in. Hg

  • Holley Power Valves

    What does a power valve do? The power valve allows the carburetor to function much leaner for part-throttle fuel economy but once the throttle is in a wide-open position, vacuum in the manifold drops to almost zero and the power valve enriches the fuel mixture. When the engine is returned to basic part-throttle operation and vacuum rises, the power valve closes up, leaning out the mixture. The power valve is important because of its effect on everyday, around-town drivability.

    The rule of thumb for power valve size selection is to divide your highest part throttle manifold vacuum reading by two and select the closest size smaller. Example: 8" Hg of manifold vacuum would use a 3.5" Hg power valve. Holley power valves include gaskets (thread size: 1/2-28).

    Items similar to Holley 125-45

    Holley 125-45

    Gaskets Included
    Power Valve Style
    Standard flow
    Power Valve Type
    Single stage
    Primary Stage Opening Vacuum (in.)
    4.5 Hg
    Sold individually
    Manufacturer's Part Number:
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