Holley - GM LS Coil Sub Harnesses

The Holley GM LS Coil Sub Harnesses (Part Number: HLY558-321) are designed as factory replacement ignition wiring harnesses for GM LS-Series engines. These harnesses connect seamlessly to any GM LSx coil and are compatible with Holley EFI LS main harnesses, as well as other factory or aftermarket harnesses utilizing a factory LS coil sub-harness. Each set includes two harnesses labeled 'ODD' and 'EVEN' for cylinders 1-3-5-7 and 2-4-6-8, respectively. The 'ODD' harness connects to cylinders 1, 3, 5, and 7, with cylinder 7 closest to the main connector, while the 'EVEN' harness connects to cylinders 2, 4, 6, and 8, with cylinder 8 closest to the main connector. These harnesses are built with high-quality connectors and Techflex F6 braided wire loom, ensuring a secure connection and a clean engine bay appearance. They offer plug-and-play fitment and can be used to replace damaged factory coil harnesses. Please note that these harnesses are not compatible with LS1 or LS6 coils. ([documents.holley.com](https://documents.holley.com/199r11436.pdf?utm_source=openai))