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HOLLEY 6.5 Power Valve

HOLLEY 6.5 Power Valve

£20.96 Inc. VAT

SKU: HOL125-65 Categories: , , Brand:

Description

Part Number: 125-65

Holley 6.5 in. Hg Single-Stage Standard Flow Power Valve

Precision-engineered power enrichment valve designed to optimize fuel delivery under heavy engine load and acceleration for Holley carburetors.

Key Features

  • ☑ Calibrated 6.5 in. Hg vacuum opening threshold for precise fuel enrichment
  • ☑ Single-stage design with standard flow capacity for reliable performance
  • ☑ Prevents engine hesitation and lean bog conditions under heavy load
  • ☑ High-grade durable diaphragm construction engineered for longevity
  • ☑ Includes high-quality sealing gasket for leak-free installation

Technical Specifications

Brand Holley
Manufacturer Part Number 125-65
Valve Type Single Stage
Vacuum Rating 6.5 in. Hg
Flow Rating Standard Flow
Thread Size 1/2-28 UNS
Gasket Included Yes

What’s Included in the Box

  • 1x Holley 125-65 6.5 in. Hg Power Valve
  • 1x Holley Power Valve Sealing Gasket

Holley performance carburetors rely on accurate power valves to deliver additional fuel when manifold vacuum drops during acceleration or high-load demands. Built to Holley’s exact OE specifications, the 125-65 power valve guarantees consistent metering and leak-free operation. JP Racing stocks genuine Holley components with fast UK dispatch and technical support from our experienced motorsport specialists.

Frequently Asked Questions

The 6.5 in. Hg rating indicates the manifold vacuum level at which the power valve begins to open. When engine manifold vacuum drops below 6.5 inches of mercury (such as under hard acceleration or climbing steep hills), the valve opens to enrich the fuel mixture and prevent lean stumble or hesitation.

As a general rule, select a power valve rated approximately 1.5 to 2.0 in. Hg below your engine's steady idle manifold vacuum in drive (or neutral for manual transmissions). A 6.5 in. Hg power valve is the standard factory selection for engines idling around 8.5 to 10 in. Hg or higher under vacuum.

Yes, the Holley 125-65 single-stage power valve includes a fresh, high-quality sealing gasket. Replacing the gasket during installation ensures a proper seal against the main metering block to prevent internal fuel leaks.

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