Holley EFI Factory Replacement Coil Sub Harness For Stock LS Coils

Holley EFI Factory Replacement Coil Sub Harness For Stock LS Coils

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Factory replacement coil harness for stock LS coils, does not fit LS1 or LS6 Coils.

PART# 558-321

Choose carefully as clearance items are not returnable for exchange or credit.

Are you tired of scouring the junkyard for stock ls coil sub harnesses? Introducing the new Holley EFI LS Coil Sub Harness. This coil sub harness is intended to be used with factory LS coils and various Holley EFI main harnesses with Coil-on-plug connectors. The Holley EFI LS coil sub harnesses are built with the same high quality connectors and wire loom found on all Holley EFI harnesses, guaranteeing a perfect match in your engine bay.


  • OEM connectors provide a secure connection between your ECU and Ignition Coils
  • Techflex F6 braided wire loom keeps your engine bay looking clean, while providing abrasion resistance
  • Plug & Play fitment
  • Can be used to replace a damaged factory coil harness
  • Fits Truck Coils, and 2005+ LS Car engines.


Brand Holley EFI
Emission Code 4
Harness Application GM
Harness Type Ignition
Product Type LS Coil Harness
UPC 090127030745
Part Number 558-321