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HOLLEY Power Valve Check Ball Kit

HOLLEY Power Valve Check Ball Kit

Original price was: £41.99.Current price is: £39.89. Inc. VAT

SKU: HOL125-500 Categories: , , Brand:

Description

Part Number: 125-500

Holley Power Valve Check Ball Kit

Safeguard your Holley carburetor power valves against blowout caused by severe engine backfires.

Key Features

  • ☑ Effective Power Valve Protection: Prevents diaphragm rupture during sudden backfire events.
  • ☑ Broad Modular Compatibility: Retrofits pre-1992 Holley 2300, 4150, 4160, 4165, and 4175 carburetors.
  • ☑ Precision Drilling Accessories: Supplied with proper drill bit size and depth stop collar for easy retrofit.
  • ☑ High-Durability Components: Includes precision brass seat, steel check ball, and calibrated spring.
  • ☑ Reliable Fuel Delivery: Prevents enriched fuel mixtures caused by damaged power valve diaphragms.

Technical Specifications

Brand Holley
Part Number 125-500
Product Type Carburetor Power Valve Protector Kit
Compatible Carburetor Series Holley 2300, 4150, 4160, 4165, 4175 (Pre-1992)
Seat Material Brass
Drill Bit Included Yes (with depth stop collar)
Emission Code 5 (Legal for non-emissions / race applications)

What’s Included in the Box

  • 1 x Precision Steel Check Ball
  • 1 x Machined Brass Seat
  • 1 x Calibrated Check Ball Spring
  • 1 x Drill Bit with Depth Stop Collar
  • 1 x Installation Instruction Guide

As a trusted supplier of high-performance UK motorsport equipment, JP Racing stocks genuine Holley fuel delivery components. Protect your carburetor investment and ensure race-ready reliability with fast UK dispatch and expert technical support.

Frequently Asked Questions

On pre-1992 Holley carburetors lacking built-in blowout protection, an engine backfire sends pressure back through the main body channel, which can rupture the power valve diaphragm. The 125-500 check ball kit installs a spring-loaded check ball into the primary power valve passage to seal against backfire pressure and protect the diaphragm from failure.

This kit is engineered for Holley Model 2300 (2-barrel), 4150, 4160, 4165, and 4175 (4-barrel) carburetors manufactured prior to 1992. Carburetors manufactured after 1992 feature factory-installed power valve blowout protection standard.

Yes, complete disassembly of the main body is necessary before drilling to prevent metal swarf from entering fuel bowls and internal metering passages. The kit includes a drill bit fitted with a collar stop to ensure precise drilling depth.

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