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Holley 550-821

Stealth Ram System Small Block Chevy

Holley 550-821


made in usa
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Estimated to ship directly from the manufacturer on 05/01/18
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Holley 550-821 Stealth Ram System Small Block Chevy $3,637.95
Stealth Ram System
  • Small Block Chevy
  • Early to Late Model Heads
  • 36 lb/hr Injectors
  • Up to 500HP
  • Satin Finish

  • Holley 550-821 Details

    Avenger Stealth Ram EFI Systems

  • Self-Tuning Fueling Strategy While You Drive
  • Requires No Laptop Computer To Set Up Or Tune
  • Includes Full Color LED Hand-Held Tuner
  • Offers Simple Setup And Easy Tuning
  • Dedicated Fuel And Oil Pressure Inputs

  • Specifications:

    Engine Make/Size
    Chevy Small Block (262-400)
    Fuel Rate
    36 lbs./hr
    Cylinder Head Type
    Without EGR
    Wiring Harness Included
    Airflow Rate (cfm)
    1,000 cfm
    Calibration Module Included
    Distributor Included
    ECM Included
    Engine Block Style
    Stock/OEM standard deck
    Fuel Pressure Regulator Included
    Fuel Pump Included
    Fuel Rails Included
    IAC Motor Included
    IAT Sensor Included
    Injection Style
    Injector Size (lbs./hr.)
    Injectors Included
    Intake Finish
    Intake Manifold Included
    Intake Material
    Intake Section Included
    MAP Sensor Included
    Metering Style
    Speed density
    Oxygen Sensor Included
    Sold as a kit
    Throttle Body Included
    Throttle Body Mounting Flange
    GM TPI
    TPS Sensor Included
    Venturi Diameter (mm)
    Throttle Body Finish
    Throttle Body Material
    Billet aluminum
    Venturi Quantity
    Manufacturer's Part Number:

    From the company that brought you the "Bolt on and Go" Street Avenger carb comes the latest technology in "Bolt on and Go" fuel injection... Avenger™ EFI! The Avenger EFI is intended for users who want a "Bolt on and Go" EFI system without the need for a laptop computer! Avenger EFI systems are perfect for performance street engines, most crate engines and mild street / strip applications. Simply bolt on an Avenger™ system, answer a few easy questions and let it do the tuning for you! The secret is in the innovative Avenger™ EFI handheld tuner and the breakthrough technology of Holley's Self-tuning fueling strategies. The compact, easy to use hand-held tuner guides you thru the simple setup wizard where you answer a few key questions about your setup. Once that basic information is loaded, you fire the car, run it thru various RPM stages and drive it to tuning perfection! The self learning strategy will automatically tune your engine as you drive to deliver the optimum air-fuel ratios for performance and mileage.

    Avenger EFI Features:
  • Self-tuning fueling strategy tunes while you drive - Designed for the user that wants ease of use without having to be a "tuning expert"
  • Requires no laptop computer to set up or tune - Included full color LED hand-held tuner offers simple setup and easy tuning of basic parameters such as engine idle speed. Still allows for users to change other parameters to further fine tune base calibrations
  • Comes complete with all hardware to retrofit EFI on a non-EFI vehicle including fuel pump
  • Dedicated fuel and oil pressure inputs
  • Allows for computer controlled ignition timing if desired
  • System can be upgraded in the future to a Holley "HP EFI System" if desired

    Stealth Ram™ Systems
    You're sure to get some attention when you pop the hood and show an Avenger Stealth Ram™ Multi-Point EFI system! Available for traditional or Vortec headed SB Chevys, the Avenger's self-tuning capabilities make it easy as 1, 2, 3 to get your car up and running with EFI. The tunnel ram design of the Stealth Ram builds power in the upper RPM range while maintaining excellent mid-range torque as well. Set up is done on the included hand-held tuner so no laptop is required!

    Avenger Stealth Ram Systems Include:
  • Intake Manifold
  • Billet Aluminum Throttle Body
  • ECU
  • Wiring Harness
  • HEI Ignition Adapter
  • Fuel Rails
  • Injectors
  • Fuel Pump & Relates Small Parts(Return fuel line to tank is not included)
    Installation Instructions:
  • Instructions For Avenger Stealth Ram EFI Systems
  • Instructions For Handheld Device

  • Some parts are not legal for use in California or other states with similar laws / regulations