Product Summary

Universal Fit, Throttle Body Injection Style

    Key Specs

    MFG. Part #550-869K
    BrandHolley Sniper

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    Are you tired of rebuilding the 50+ year old Rochester Quadrajet (Q-Jet) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? Introducing Sniper EFI Quadrajet. The first bolt on spread bore electronic fuel injected throttle body system that does not require any additional adapters, sealing plates, or intake manifold swaps! The Sniper EFI Rochester Quadrajet (Q-Jet) system retains the same great features as the 4150 Sniper EFI version such as; four 100lb/hr Injectors, built in timing control, a 3.5" full color touchscreen and much more! The throttle body will support up to 500 horsepower naturally aspirated. In addition to all of these great tried and true features, the Sniper EFI Rochester Quadrajet (Q-Jet) system will fit most stock air cleaners and offers multiple fuel inlet configurations that allow for a stock appearing installation!
    • Throttle body mounted ECU – no extra boxes to mount
    • Supports up to 500hp with Four 100 Lb/Hr Injectors!
    • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
    • Integrated ignition timing control
    • Transmission provisions on throttle lever for TH350/TH400 and 200R4/700R4
    • Fits most stock Rochester Quadrajet™ (Q-Jet) air cleaners
    • Brake Booster adapter included, if required
    • Universal Throttle and transmission kickdown bracket included
    • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays.
    • Simple Calibration Wizard (Answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
    • Complete fuel system includes – external fuel pressure regulator preset to 58.5psi, 20ft of 3/8” Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
    • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
    • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
    • OEM Style Throttle Position Senser (TPS)/ and Idle Air Control (IAC) for years of dependable service.
    • Included clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
    • Requires external fuel pressure regulator, such as: 12-886 or 12-879
    • CFM: 715
    • Finish: Classic Gold
    • Flange Style: Spreadbore
    • Fuel Pressure: 58.5 PSI
    • Height: 3.28"
    • Injector Size: 100 lb/hr @ 58.5 PSI
    • Inlet / Outlet Size: 9/16-18 Female O-Ring (AN 6)
    • MAP Sensor: 2Bar
    • Max Horsepower Rating: 500 Naturally Aspirated
    • Throttle Bore: 1.375 Primary / 2.00 Secondary
    • Transmission: 700R4/200R4


    CARB Warning

    For race/ off road use or for use on pre-1966 vehicles.

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


    MFG. Part #550-869K
    BrandHolley Sniper
    Carburetor Flange Type4-Barrel Spread Bore
    Injection StyleThrottle Body
    User TunableYes
    Self TuningYes
    Injectors IncludedYes
    Injector Size100 lb/hr @ 58.5 PSI
    Intake Manifold IncludedNo
    CFM715 CFM
    Venturi Quantity4
    Fuel Pump IncludedYes
    Calibration Module IncludedYes
    Wiring Harness IncludedYes
    Fuel Pressure Regulator IncludedYes
    MAP Sensor IncludedYes
    IAC Motor IncludedYes
    TPS Sensor IncludedYes
    Hardware IncludedYes
    GTIN Code090127059005
    Sold in QuantityKit