This main harness fits 1999-2004 Ford 2-valve and 4-valve Modular 4.6L and 5.4L engines and is designed for use with Holley's HP EFI and Dominator EFI systems.
Specifications:
- Application: 1999-2004 Ford Modular 4.6L & 5.4L, 2V and 4V
- Harness Application: Ford
- Harness Type: Main
- Compatible ECUs: HP EFI, Dominator EFI
- Part Number: 558-108
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 Ford engines does this main harness fit?
It fits 1999-2004 Ford Modular 4.6L and 5.4L engines, both 2-valve and 4-valve.
Which Holley EFI systems is this harness designed for?
It's built for use with Holley's HP EFI and Dominator EFI systems.
Is this harness legal for street use?
No. This part is for Racing Use Only Vehicles and is not legal to install on an emissions-controlled street vehicle.
What part number is this harness?
This Ford 2V & 4V Modular main harness is Holley part number 558-108.

