The holley carburetors that are intended for use with superchargers, have a unique capability that allows their power valves to reference the intake manifold vacuum below the supercharger. This allows the power valve to operates it should, based off intake manifold vacuum. A power valve provides further enrichment to the main metering system under load and low vacuum conditions.

Features

• With single stage
• A power valve provides further enrichment to the main metering system under load and low vacuum conditions
• Without external referencing, the power valve would be reading the supercharger boost pressure, which has no bearing on the engine load
• Include gasket

Specification

• Compatibility – Holley carburetors
• Flow type – Single stage standard flow
• Pressure – 8.5 in. Of mercury
• Includes gasket – Yes