An EFI system depends on a clean, constant voltage source, and grounds are just as important as the power side. This Holley harness kit includes the main harness, power harness, and injector harness needed to support your primary GM LS2/LS3/LS7 system.
Specifications:
- Harness Application: LSX
- Crank Sensor: 58X
- Injector Connector: USCAR (EV6)
- Includes: Main Power Harness, LS2 Main Harness, LSX Injector Harness
- Product Type: Harness Kit
- Part Number: 558-501
Works with Dominator and HP ECUs. You will need to purchase a compatible ECU and O2 sensor separately to complete the kit.
Compliance: This part is legal for sale and use on Racing Use Only Vehicles — competition vehicles that are not registered and never operated on the street. It is against the law to install this part on an Emissions Controlled Vehicle (1966-and-newer California-certified or 1968-and-newer federally certified vehicles).
FAQ
Does the Holley 558-501 harness kit include an ECU?
No, you'll need to purchase a compatible ECU (Dominator or HP) and an oxygen sensor separately.
What crank sensor and injector style does this harness support?
A 58X crank sensor and USCAR/EV6 injector connectors.
What's included in the kit?
A main power harness, LS2 main harness, and LSX injector harness.
What engines is this designed for?
GM LS2, LS3, and LS7 applications.

