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Holley 125-105

Single-Stage Standard Flow Power Valve Opening Vacuum: 10.5" Hg.

Holley 125-105

510-125-105

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Holley 125-105 Single-Stage Standard Flow Power Valve Opening Vacuum: 10.5" Hg. $9.94
Single-Stage Standard Flow Power Valve
Opening Vacuum: 10.5'' Hg.

Holley 125-105 Details

Single-Stage Standard Flow Power Valves

  • Includes Gasket
  • Opening Vacuum 10.5 in. Hg

  • Specifications:

    Gaskets Included
    Yes
    Power Valve Style
    Standard flow
    Power Valve Type
    Single stage
    Primary Stage Opening Vacuum (in.)
    10.5 Hg
    Quantity
    Sold individually
    Manufacturer's Part Number:
    125-105

    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).

    125-105 - Holley Power Valves is rated 5.0 out of 5 by 1.
    Rated 5 out of 5 by from A delightful little valve Zowie, these are great. Very enriching. My engine sucks it shut until I mash down on the pedal, which eliminates the suck part, and the gas flows right on into my engine. Makes it really happy!
    Date published: 2017-05-13
    • y_2017, m_7, d_25, h_4
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