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Holley GM Distributor Wiring Harness Adapters 558-304 Harnesses, EFI, HEI Distributor, Adapter Harness, Small Cap, Computer Controlled, for Avenger, HP, Dominator EFI Systems, Each

Holley GM Distributor Wiring Harness Adapters 558-304 Harnesses, EFI, HEI Distributor, Adapter Harness, Small Cap, Computer Controlled, for Avenger, HP, Dominator EFI Systems, Each

A$236.77
LOW STOCK! Est Ship 4-7 days. In stock at 2 locations (more than 10 available)

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Description

EFI Wiring Harness - Ignition Adapter Harness - GM Small Cap HEI Distributor to Holley Avenger / HP / Dominator EFI - Each


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:16:14

Data: v4.2 - Upd: 2026-11-08 06:33:23

Features

Vehicle Compatibility and Return Conditions.

This item was designed and engineered in the USA for US domestic vehicles. OBD tools, ECUs, dongles, programmers, and tuners may have limited compatibility with vehicles outside the USA due to regional differences in emission standards and system configurations. Some features and functionality may vary depending on the vehicle and location.

Some electronic tuning devices and programmers require activation, registration, or pairing with a specific vehicle’s VIN (Vehicle Identification Number). Once activated or paired, these devices may become permanently associated with that vehicle, restricting or preventing their use on another vehicle, resticting our ability to offer returns or exchanges.

Please review the product details and images to ensure it meets your needs. For clarification or assistance, feel free to contact a StreetFX agent. Note: Returns are not accepted for special order or tuning products unless the unit is deemed faulty.

(keyword: computer)

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Holley, Hilborn, Holley Efi, Retrobright, Terminator X
StreetFX SKU hly558-304
SFX Item ID 4783349
Accounting SKU hly-558-304
Manufacturer SKU 558-304
Manufacturer UPC 090127666777
Alternative References 558-304, HLY-558-304, HOL558-304

Wiring Harnesses, Holley EFI, HEI Distributor, Adapter Harness, Small Cap, Computer Controlled, for Avenger, HP, Dominator EFI Systems, Each

Holley GM distributor wiring harness adapters are designed to connect the distributor to the Holley ECU. They fit all digital interactive Holley Pro-Jection and Commander 950 fuel injection systems. The harness adapters will allow the use of the ignition control feature that is part of the Holley ECU.

Product Attributes
BrandHolley
Manufacturer's Part Number558-304
Part TypeFuel Injection System Wiring Harnesses
Product LineHolley GM Distributor Wiring Harness Adapters
UPC090127666777
Fuel Injection StyleMulti-port
QuantitySold individually.
NotesFor HEI distributor with small cap.

Compatibility

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