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Holley Power Valves


Holley
Holley Power Valves

Product images may differ from actual product appearance.

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).


19 Products
Single-Stage Standard Flow Power Valves

510-125-25
Single-Stage Standard Flow Power Valve
Opening Vacuum: 2.5'' Hg.
$9.49
Ships

510-125-35
Single-Stage Standard Flow Power Valve
Opening Vacuum: 3.5'' Hg.
$9.49
Ships

510-125-45
Single-Stage Standard Flow Power Valve
Opening Vacuum: 4.5'' Hg.
$9.49
Ships

510-125-50
Single-Stage Standard Flow Power Valve
Opening Vacuum: 5.0'' Hg.
$9.49
Ships

510-125-55
Single-Stage Standard Flow Power Valve
Opening Vacuum: 5.5'' Hg.
$9.49
Ships

510-125-65
Single-Stage Standard Flow Power Valve
Opening Vacuum: 6.5'' Hg.
$9.49
Ships

510-125-75
Single-Stage Standard Flow Power Valve
Opening Vacuum: 7.5'' Hg.
$9.49
Ships

510-125-85
Single-Stage Standard Flow Power Valve
Opening Vacuum: 8.5'' Hg.
$9.49
Ships

510-125-95
Single-Stage Standard Flow Power Valve
Opening Vacuum: 9.5'' Hg.
$9.49
Ships

510-125-105
Single-Stage Standard Flow Power Valve
Opening Vacuum: 10.5'' Hg.
$9.49
Ships
Single-Stage High Flow Power Valves

510-125-125
Single-Stage High Flow Power Valve
Opening Vacuum: 2.5'' Hg.
$14.75
Ships

510-125-135
Single-Stage High Flow Power Valve
Opening Vacuum: 3.5'' Hg.
$14.75
Ships

510-125-145
Single-Stage High Flow Power Valve
Opening Vacuum: 4.5'' Hg.
$14.75
Ships

510-125-155
Single-Stage High Flow Power Valve
Opening Vacuum: 5.5'' Hg.
$14.75
Ships

510-125-165
Single-Stage High Flow Power Valve
Opening Vacuum: 6.5'' Hg.
$14.75
Ships

510-125-185
Single-Stage High Flow Power Valve
Opening Vacuum: 8.5'' Hg.
$14.75
Ships

510-125-1005
Single-Stage High Flow Power Valve
Opening Vacuum: 10.5'' Hg.
$14.75
Ships
Power Valve Plug

510-26-36
Power Valve Plug
  • Race Only
  • $5.40
    Ships
    Power Valve Gaskets

    510-1008-1597
    Power Valve Gaskets
  • Full Round Style
  • 10/pkg
  • $8.83
    Ships

    19 Products