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Holley HP EFI Smart Coil Sub Harnesses 558-318 Ignition Wiring Harnesses, EFI, C-N-P Ignition Sub-Harness, 12-gauge Wire, for EFI, Coils, Chevy, LS Based, 4.8-7.0L, Each

Holley HP EFI Smart Coil Sub Harnesses 558-318 Ignition Wiring Harnesses, EFI, C-N-P Ignition Sub-Harness, 12-gauge Wire, for EFI, Coils, Chevy, LS Based, 4.8-7.0L, Each

A$623.15
IN STOCK! Est Ship 4-7 days. In stock at 2 locations (more than 10 available)

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Description

Ignition Wiring Harness - Big Wire C-N-P Sub Harness - V8 - Each


Data: v2 - Desc: v4.2 - Upd: 2026-11-08 02:16:25

Data: v4.2 - Upd: 2026-11-08 06:32:46

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: efi)

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 hly558-318
SFX Item ID 4783534
Accounting SKU hly-558-318
Manufacturer SKU 558-318
Manufacturer UPC 090127002551
Alternative References 558-318, HLY-558-318, HOL558-318

Ignition Coil Wiring Harnesses, Holley EFI, C-N-P Ignition Sub-Harness, 12-gauge Wire, for HP EFI, Smart Coils, Chevy, LS Based, 4.8-7.0L, Each

Holley HP EFI smart coil sub harnesses contain two preterminated harnesses designed to work with Holley HP smart coils used on 8-cylinder engines. One end plugs directly into the Holley smart coil, and the other end features a 7-pin Metri-Pak connector that plugs into the Holley universal coil-on-plug harness (HLY-558-307, not included), Holley LSx main harness, or factory GM LSx harnesses.

Product Attributes
BrandHolley
Manufacturer's Part Number558-318
Part TypeIgnition Coil Wiring Harnesses
Product LineHolley HP EFI Smart Coil Sub Harnesses
UPC090127002551
QuantitySold as a kit.
NotesFor use with the Holley Smart Coils HLY-556-112. Harness uses 12-gauge wire.

Compatibility

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