This main harness is designed for fuel-injected Ford small block engines such as the 5.0L or 5.8L Windsor, with plug-and-play ignition capability for Dual Sync and HyperSpark distributors. It's pre-terminated with a Ford PWM IAC connector for the OEM idle air control motor found on late-80s and early-90s engines.
Specifications:
- Harness application: Ford 5.0L/5.8L Windsor
- Harness type: Main, 29-pin connectors
- Ignition compatibility: Dual Sync and HyperSpark distributors
- Compatible ECUs: Holley EFI Dominator, HP, Terminator X, and Terminator X Max
- Pre-terminated: Ford PWM IAC connector
- Part Number: 558-128
For OEM Ford fuel injectors, pair with injector harness 558-209. For TFI distributor applications, use ignition adapter 558-305. The main harness supports all primary engine sensors, fuel and ignition for eight-cylinder engines, the #1 wideband oxygen sensor, and the first four programmable input/output channels across its two connectors (J1A and J1B).
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 engines is this harness designed for?
It's built for fuel-injected Ford small block engines, including the 5.0L and 5.8L Windsor.
What ECUs is it compatible with?
It works with Holley EFI Dominator, HP, Terminator X, and Terminator X Max ECUs.
Does it support plug-and-play ignition?
Yes, it offers plug-and-play compatibility with Dual Sync and HyperSpark distributors.
Is this legal for street use?
This part is legal for sale and use on Racing Use Only vehicles and cannot legally be installed on emissions-controlled street vehicles.
