How to Change a Power Valve on a Holley?

Answer Holley carburetors feature a power valve designed to increase fuel mileage under normal driving conditions by minimizing the amount of fuel used by the carburetor. When the carburetor’s throttle ... Read More »

Top Q&A For: How to Change a Power Valve on a Holley

How to Install a Power Valve in a Holley?

The power valve in a Holley carburetor opens under conditions of low engine vacuum, to supply extra fuel to the engine when it is under heavy load. Occasionally power valves need to be changed, as ... Read More »

How to Replace the Power Valve on a Holley Carburetor?

Power valves on Holley carburetors are usually trouble free, but they do occasionally require replacement. Engine modifications may dictate the use of a different power valve. You may want to chang... Read More »

How to Install a Holley Accelerator Check Valve?

During acceleration, the accelerator pump delivers fuel directly to the intake bores via accelerator squirters mounted within the intake bores -- one squirter for each set of bores. The squirters r... Read More »

How Holley Power Valves Work?

Holley carburetors employ a power enrichment system, operated by vacuum, and power valves to supply additional fuel to the carburetor under heavy load. The correct power valve to use can be determi... Read More »