Power Valve, Holley, Carburetor, Single Stage

Single-Stage Carburetor Power Valve by Holley®

Vacuum-rated enrichment valves let you match additional fuel delivery to engine load.

This Holley® single-stage power valve controls additional fuel enrichment as engine vacuum falls under load. Choose the vacuum rating needed for the carburetor calibration: 3.5, 4.5, 5.5, 6.5, 7.5 or 8.5 inHg. The 5.5-inHg option uses high-flow part 125-155; the other mapped choices are standard-flow valves. The number is the vacuum opening rating, not fuel pressure. Select by the carburetor configuration and engine vacuum rather than by vehicle model alone.

• Single-stage vacuum-operated enrichment valve • 3.5 through 8.5-inHg ordering choices • 5.5-inHg choice uses high-flow 125-155 • Other listed choices use standard flow • Rating measures vacuum, not fuel pressure