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Pro-Jection 2D Throttle Body Fuel Injection System 670 CFM 2-Barrel
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HOLLEYPART NUMBER: 510-502-20S

Pro-Jection 2D Throttle Body Fuel Injection System 670 CFM 2-Barrel

$1,45499
ShippingShips on 10/28/2026
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Pro-Jection EFI System
Pro-Jection 2D Throttle Body Fuel Injection System
  • Carbureted V8 Engines Up to 275 HP
  • 670 CFM 2-Barrel Throttle Body
  • Includes ECM and Wiring Harness
  • Speed-Density Fuel Control
  • Cast Aluminum Throttle Body

    Pro-Jection 2D converts a carbureted V8 to throttle-body fuel injection using a 670 CFM 2-barrel throttle body, twin high-flow injectors, and a speed-density ECM for easier starts and steadier drivability.

    Holley 502-20S Highlights:

    • Fits carbureted V8 engines up to 275 HP.
    • 670 CFM 2-barrel cast-aluminum throttle body.
    • Speed-density ECM and wiring harness included.
    • Two high-flow 80 lb./hr. fuel injectors.
    • Built-in fuel pressure regulator preset to 15 psi.
    • MAP and IAT sensors included.
  • A Complete Stand Alone System...
    Designed by Holley to retro-fit carbureted & non-computerized V-8 engines with a fuel injection system. Includes all components necessary for installation. The Pro-Jection 2D throttle body injection system works with GM, Chrysler, Ford & AMC small block and big block engines Up To 275HP.

    Notes: This system does not require a laptop! The 670cfm Pro-Jection system will not support over 275HP. The system will install on both square flange and spread bore intake manifolds.

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    Features

    • Includes a quiet, self-priming electric fuel pump that supplies fuel at 300 lb/hr and 15 psi for maximum engine performance. A 10 micron screen filter located behind the pump insures clean fuel for trouble-free operation.
    • A temperature sensor positioned in the water jacket provides the ECU with accurate and timely fuel enrichment information for quick start-ups on cold engines.
    • A distribution ring rests on the air cleaner flange to direct the flow of incoming air into the throttle bores for more efficiency.
    • Holley ECU box can be mounted on any flat surface within reach for easy calibration adjustments. System is easily switched for small-block or big-block applications up to 275 horsepower.
    • Weather-pack terminals on all electrical connections insure water-tight, non-corrosive sealing.
    • Dual 80 lb./hour Holley designed and manufactured injectors.
    • Wide angle conical spray pattern of injectors maximizes power and efficiency.
    • Pressure regulator is fully adjustable .
    • ECM is user-adjustable to provide various air/fuel settings for: Idle, Accelerator Pump, Mid-Range, Power, Choke.
    • Adjustable fast idle solenoid
    • 2D digital system is a microprocessor-based speed density system.
    • Complete and detailed Holley installation instructions.

      What are the benefits of upgrading to a fuel injection system?
    • Improved Driveability
    • Fantastic Throttle Response
    • Improved Fuel Economy
    • Increased Power
    Part TypeThrottle Body
    Product LineHolley 670cfm 2-Barrel Digital Fuel Injection System & Accessories
    BrandHOLLEY
    Package Height9.2
    Package Width12.3
    Package Length18.2
    Weight18.2 PG
    Part CategoryPerformance Parts
    Throttle Body FinishNatural
    Part FitmentUniversal
    Vendor Part Number502-20S
    Package Qty1
    Package TypeEA
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