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Instruction Sheets for Part Number HLY-550-616N
Holley EFI Systems Wiring Harnesses
Engine Management Systems, HP EFI, ECU and Harness, Up to 16-Injectors, 8-Coils, NTK O2, Wideband, Ford, Lincoln, Mercury, 2-valve, 4.6L, 5.4L, Kit
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Estimated Ship Date: Nov 3, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
550-616N
Part Type:
Product Line:
Summit Racing Part Number:
HLY-550-616N
UPC:
090127716113
Fuel Injection Style:
Multi-port
Metering Style:
Mass airflow
Quantity:
Sold as a kit.
Notes:
Interfaces a Holley EFI ECU to a 2-valve Ford Modular engine. Designed to be used in conjunction with an injector harness, a coil harness, and ignition modules. Allows accurate control of fuel and ignition along with additional controls for nitrous, boost or water/methanol. Uses most stock sensors; includes HP ECU, Jetronic “Bosch Style” injector harness, and NTK oxygen sensor.
Holley EFI Systems Wiring Harnesses
Holley offers a variety of direct replacement EFI wiring harnesses, including multi-port, sequential, and throttle body injection styles. These units are made with premium components to ensure better reliability and performance for your ride--and they're compatible with many engine swaps. Holley EFI systems wiring harnesses are sold individually or as a kit; choose the model needed for your fuel injection application.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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