Holley EFI ignition sub-harness for running Holley HP Smart Coils on an 8-cylinder engine. It's a pair of coil harnesses laid out like the factory GM LSx coil harnesses, built to work with Holley HP and Dominator ECUs.
Pair of coil harnesses for 8-cylinder engines
Factory GM LSx-style layout
Connects Holley HP Smart Coils
Works with Holley HP and Dominator ECUs
Plugs straight into Holley LSx plug-and-play main harnesses as a direct replacement for the factory coils
With a non-LSx Holley main harness, adapter PN 558-307 is required
Holley part number 558-312. UPC 090127688120.
Emissions code 3: for use on uncontrolled (non-emissions) vehicles only.
