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Instruction Sheets for Part Number HLY-550-500
Holley HP EFI Universal Retrofit Engine Management Systems 550-500
Part Number: HLY-550-500
Holley HP EFI Universal Retrofit Engine Management Systems
Fuel Injection Systems, HP EFI Retrofit, Engine Management, Multi Point, 4-barrel, 4150 Flange, Sensors, Fuel Rails, Regulator, Wire Harness, Kit
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Estimated Ship Date: Nov 9, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
550-500
Part Type:
Product Line:
Summit Racing Part Number:
HLY-550-500
Item Number:
1591109
UPC:
090127666883
Fuel Injection Style:
Multi-port
Fuel Injection System Type:
Single 4-Barrel Throttle Body (4150 Flange)
Timing Control Compatible:
Yes
ECM Included:
Yes
Self Tuning:
Yes
User Tunable:
Yes
Fuel System Included:
None
Ignition System Included:
None
Power Distribution Included:
None
User Interface Included:
None
EGR:
No
Transmission Controller Included:
No
Metering Style:
Speed density
Multi-Port Fuel Rails Included:
Yes
Throttle Body Included:
Yes
Throttle Body Mounting Flange:
4-barrel square bore
Venturi Quantity:
4
Injectors Included:
No
Calibration Module Included:
No
Wiring Harness Included:
Yes
Oxygen Sensor Included:
Yes
Fuel Pressure Regulator Included:
Yes
MAP Sensor Included:
Yes
IAT Sensor Included:
Yes
TPS Sensor Included:
Yes
IAC Motor Included:
Yes
Quantity:
Sold as a kit.
Holley HP EFI Universal Retrofit Engine Management Systems
Progammable EFI has been simplified! Holley HP EFI universal retrofit engine management kits make it easy to install multi-point fuel injection on your Mopar, Ford, or other type engine. Holley Performance universal retrofits are designed for 4150 and 4500 carburetor-style intakes. HP kits include injector bungs and un-machined fuel rails, so you can modify them to fit any single plane 4-barrel intake manifold. You'll also receive all necessary wiring, ECU, sensors, and a throttle body. Retrofit your engine for maximum performance with complete tunability via your laptop, or opt for self-tuning capabilities and rest assured that your fuel curves are accurate. It's a new era in fuel injection and it comes with a very appealing price tag, compliments of Holley and HP EFI universal retrofit engine management systems.
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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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