This Holley EFI harness kit is built for GM TPI and Stealth Ram applications, supplying the clean, constant voltage and solid grounds an EFI system depends on. The kit bundles the main harness, power harness, and injector harness needed to support a primary GM TPI/Stealth Ram EFI system.
Specifications:
- Harness Application: GM TPI and Stealth Ram
- Ignition Type: CD Ignition (No Timing Control)
- Injector Connector: Jetronic/Minitimer (Bosch)
- Product Type: Harness Kit
- Includes: Stealthram/TPI Main Harness, Main Power Harness, V8 Injector Harness, HEI Ignition Harness, Ignition Adapter, and Tach Input
- Compatible with Dominator and HP ECUs
- Part Number: 558-503
A separate ECU and O2 sensor are required to complete this 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
What GM applications does the 558-503 harness kit fit?
It's built for GM TPI and Holley Stealth Ram EFI setups using CD ignition (no timing control) and Bosch Jetronic/Minitimer style injector connectors.
What's included in the kit?
The kit includes the Stealthram/TPI main harness, main power harness, V8 injector harness, HEI ignition harness, ignition adapter, and tach input.
Do I need anything else to complete the system?
Yes, a separate ECU and O2 sensor are required to make this a complete, running EFI system.
Is this harness compliant for street use?
No. It's legal for Racing Use Only vehicles and cannot be installed on an emissions-controlled street vehicle.
