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Holley

Holley HP EFI Smart Coil Sub Harnesses 558-312 Ignition Wiring Harnesses, EFI, Coil, Ignition Harness, for HP/Dominator ECU, Chevy, LS Based, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L, Each

SKU: HLY558-312

Ignition Coil Wiring Harnesses
Holley HP EFI Smart Coil Sub Harnesses 558-312 Ignition Wiring Harnesses, EFI, Coil, Ignition Harness, for HP/Dominator ECU, Chevy, LS Based, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L, Each

Holley

Holley HP EFI Smart Coil Sub Harnesses 558-312 Ignition Wiring Harnesses, EFI, Coil, Ignition Harness, for HP/Dominator ECU, Chevy, LS Based, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L, Each

SKU: HLY558-312

Ignition Coil Wiring Harnesses
A$614.07
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.
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Description

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.

Part Type

HP EFI Sub-Harnesses - Smart Coil

Data: v4.2 - Upd: 2026-10-13 18:46:55

Specifications

Product Attributes - Brand
Holley
Product Attributes - Manufacturer's Part Number
558-312
Product Attributes - Part Type
Ignition Coil Wiring Harnesses
Product Attributes - Product Line
Holley HP EFI Smart Coil Sub Harnesses
Product Attributes - UPC
090127688120
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Notes
For use with the Holley Smart Coils HLY-556-112. Connects to Holley HP or Dominator ECU's.

Reference Information

Brand Name/s Holley
StreetFX SKU hly558-312
SFX Item ID 4783981
Supplier Item Code 4783981
Manufacturer SKU 558-312
Manufacturer UPC 90127688120
Alternative References HOL558-312, 4.8L, 5.3L, 6.0L, 6.2L, 7.0L

Compatibility

Application Data
  • MakeCHEVROLET
    Beginning Year1997
    Ending Year2004
    Engine TypeV8
    Engine Size5.7L/350
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2014
    Engine TypeV8
    Engine Size5.3L/325
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2017
    Engine TypeV8
    Engine Size4.8L/294
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
  • MakeCHEVROLET
    Beginning Year1999
    Ending Year2017
    Engine TypeV8
    Engine Size6.0L/364
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
  • MakeCHEVROLET
    Beginning Year2006
    Ending Year2015
    Engine TypeV8
    Engine Size7.0L/427
    Engine FamilyChevy small block Gen III/IV (LS-based engines)
  • MakeCHEVROLET
    Beginning Year2008
    Ending Year2017
    Engine TypeV8
    Engine Size6.2L/376
    Engine FamilyChevy small block Gen III/IV (LS-based engines)

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