Street. Track. Everything between.
Your garage Find parts for your vehicle Select year, make and model to narrow your search.

Holley

Holley EFI Systems Wiring Harnesses 558-103 Harnesses, EFI, Replacement, LS Style, 58X/4X Main Harness, Speed Density, for HP, Dominator, Only, Chevy, 6.0-7.0L, Each

SKU: HLY558-103

Fuel Injection System Wiring Harnesses
Holley EFI Systems Wiring Harnesses 558-103 Harnesses, EFI, Replacement, LS Style, 58X/4X Main Harness, Speed Density, for HP, Dominator, Only, Chevy, 6.0-7.0L, Each

Holley

Holley EFI Systems Wiring Harnesses 558-103 Harnesses, EFI, Replacement, LS Style, 58X/4X Main Harness, Speed Density, for HP, Dominator, Only, Chevy, 6.0-7.0L, Each

SKU: HLY558-103

Fuel Injection System Wiring Harnesses
A$1,343.61
IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.
View cart 0
We accept
American Express
Mastercard
Visa
PayPal Checkout
Direct Deposit
Afterpay
Apple Pay
Google Pay
Zip Pay

Description

Holley offers a variety of direct replacement EFI wiring harnesses, including multi-port, sequential, and throttle body injection styles. These units are made with premium components to ensure better reliability and performance for your ride--and they're compatible with many engine swaps. Holley EFI systems wiring harnesses are sold individually or as a kit; choose the model needed for your fuel injection application.

Part Type

Main Wiring Harness LS2 & LS3

Data: v4.2 - Upd: 2026-10-14 22:06:47

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
558-103
Product Attributes - Part Type
Fuel Injection System Wiring Harnesses
Product Attributes - Product Line
Holley EFI Systems Wiring Harnesses
Product Attributes - UPC
090127666739
Product Attributes - Fuel Injection Style
Multi-port
Product Attributes - Metering Style
Speed density
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Notes
LS2, LS3, and LS7 main engine harness. For applications with 58x crank and 4x cam sensors.

Reference Information

Brand Name/s Holley
StreetFX SKU hly558-103
SFX Item ID 4783662
Supplier Item Code 4783662
Manufacturer SKU 558-103
Manufacturer UPC 90127666739
Alternative References HOL558-103, 58X/4X, 6.0-7.0L

Compatibility

Application Data
  • Stock EFI SystemNo
    EFI System ManufacturerHolley
    UniversalNo
    MakeCHEVROLET
    Beginning Year2005
    Ending Year2009
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    EFI System Kit NumberHLY-550-603
    Application NotesLS2, LS3, and LS7 main engine harness. For applications with 58x crank and 4x cam sensors.
  • Stock EFI SystemNo
    EFI System ManufacturerHolley
    UniversalNo
    MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    EFI System Kit NumberHLY-550-603
    Application NotesLS2, LS3, and LS7 main engine harness. For applications with 58x crank and 4x cam sensors.
  • Stock EFI SystemNo
    EFI System ManufacturerHolley
    UniversalNo
    MakeCHEVROLET
    Beginning Year2008
    Ending Year2017
    Engine TypeV8
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
    EFI System Kit NumberHLY-550-603

Loading compatibility information...

Keep shopping

More from Holley