Holley
GM LS Coil Sub Harnesses
SKU: H00E 558-321
Description
Part #: 558-321
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.
Features:
- 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.
Factory replacement coil harness for stock LS coils, does not fit LS1 or LS6 Coils.
Fitment
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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | Holley |
| Part Number | H00E 558-321 |
| Weight | 0.75 lb |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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