Holley Power Valve Single Stage Standard Flow 5"

Be sure to measure the correct manifold vacuum reading before picking up a Holley 5" Standard Flow Single Stage Power Valve 125-50. The 1/2-28 threaded gasket will screw right into place for a simple replacement. Each Holley Single Stage Power Valve will restore a standard fuel mixture flow. With a 5" Hg primary stage opening vacuum, you can depend on a leaner part-throttle fuel economy. 

Features and Benefits:
- Sold Individually
- Includes 1/2-28 Threaded Gaskets
- 5" Hg Primary Stage Opening Vacuum
- Direct-Fit Replacement

Tech Tip: Divide your highest part throttle manifold vacuum reading by two and select the closest size smaller for an accurate power valve measurement (ex: 8" Hg of manifold vacuum would use a 3.5" Hg power valve).