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HOLLEY 5.5 Power Valve (Promise 24)

HOLLEY 5.5 Power Valve (Promise 24)

£23.45 Inc. VAT

SKU: HOL125-55 Categories: , , Brand:

Description

Part Number: 125-55

Holley Single-Stage Power Valve (5.5 in. Hg)

Precision-engineered standard flow power valve designed to enrich carb fuel metering under low vacuum engine load conditions.

Key Features

  • ☑ 5.5 in. Hg Opening Threshold: Opens reliably when manifold vacuum drops below 5.5 inches of mercury to supply additional fuel under heavy engine load.
  • ☑ Single-Stage Standard Flow: Delivers precise, controlled fuel enrichment for street performance, circuit motorsport, and drag racing applications.
  • ☑ Direct Holley Compatibility: Fits standard Holley modular carburetors including popular 4150, 4160, and 2300 series.
  • ☑ Included Sealing Gasket: Comes supplied with a fresh high-grade gasket to ensure a leak-free seal upon installation.

Technical Specifications

Brand Holley Performance
Manufacturer Part Number (MPN) 125-55
Valve Type Single-Stage Power Valve
Opening Vacuum Rating 5.5 in. Hg (inHg)
Flow Rate Standard Flow
Gasket Included Yes
Grade Type Performance

What’s Included in the Box

  • 1 x Holley 125-55 Single-Stage Power Valve (5.5 in. Hg)
  • 1 x Power Valve Sealing Gasket

As an authorized UK performance motorsport retailer, JP Racing supplies genuine Holley fuel delivery components backed by expert technical advice and fast UK dispatch. Keep your carburetor calibrated accurately with high-grade Holley replacement tuning parts.

Frequently Asked Questions

The 5.5 in. Hg rating indicates that the power valve will open to enrich the carburetor's main metering circuit whenever engine intake manifold vacuum drops to or below 5.5 inches of mercury (Hg), providing additional fuel under acceleration or heavy engine loads.

A standard rule of thumb is to measure your engine's manifold vacuum at idle with a vacuum gauge, then divide that reading by two. For example, if your idle vacuum is 11 to 12 in. Hg, a 5.5 in. Hg power valve like the Holley 125-55 is ideal.

Yes, the Holley 125-55 comes supplied with a fresh sealing gasket to ensure a proper, leak-free installation into your Holley carburetor metering block.

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