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Holley Sniper EFI

Holley Sniper EFI Quadrajet™ Master Kit - Black Ceramic

Rochester Quadrajet™ (Q-Jet) 4-Barrel Fuel Injection Conversion - Self-Tuning System with Handheld EFI Controller - Black Ceramic

Part # 550-868D Be the first to write a review
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This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

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Holley Sniper EFI Quadrajet™ Master Kits combine the Sniper EFI Self Learning Throttle Body with an easy-to-install, in-tank, retrofit returnless Fuel Module, 20 feet of Earl's Vapor Guard fuel hose, and all of the required fittings you need. The included fuel system places a 340 LPH fuel pump in the tank, which can easily be accomplished with basic hand tools. The Sniper EFI Quadrajet system retains the same great features as the Sniper EFI 4bbl version. This includes four 100 lb/hr injectors, built in timing control (when used with a HyperSpark or Pro Billet distributor), a 3.5" full color touchscreen, and much more! The throttle body will support up to 500 naturally aspirated horsepower. In addition to all of these tried and true features, the Sniper EFI Quadrajet system will fit most stock air cleaners and offers multiple fuel inlet configurations that allow for a stock appearing installation. The returnless drop-in master kits make plumbing your Sniper EFI installation as hassle free as possible by locating the fuel pressure regulator in the fuel tank, thus eliminating the need to run a fuel return line from the engine bay, back to the fuel tank.


  • Designed to deliver the signature Rochester Roar at wide open throttle
  • Supports up to 500hp with Four 100 lb/hr Injectors
  • Sniper Retrofit fuel module installs in any fuel tank from 7” to 12” deep to fit a wide variety of applications
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
  • No external fuel return line required
  • Throttle body mounted ECU – no extra boxes to mount
  • Transmission provisions on throttle lever for TH350/TH400 and 2004R/700R4
  • Fits most stock Rochester Quadrajet (Q-Jet) air cleaners
  • Brake Booster adapter included, if required for your application
  • Universal throttle and transmission kickdown bracket included
  • Only four wiring connections required (Battery +, Battery - , Switched Ignition & RPM)
  • Self-tuning ECU means you don’t need a laptop or have to be a computer/tuning wiz to have EFI
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • OEM Style TPS, IAC, and fuel pressure regulator, 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
  • Includes complete fuel system consisting of; Sniper EFI Retrofit Returnless Fuel Module; 20 ft. of 3/8” Vapor Guard Fuel Hose; 5 stainless steel hose clamps, a post filter, and various Earls fittings and caps
  • The fuel modules innovative clamping system allows you to locate the module anywhere in the tank beside your existing sending unit
  • Available in 3 Finishes - Gold, Shiny and Black
United States Coast Guard Approved
Certified to ISO 8846, SAE J1171 Requirements
Brand Holley Sniper EFI
Coast Guard ApprovedYes
Emission Code3
FinishBlack Ceramic
Flange StyleSpreadbore
Fuel Pressure58.5 PSI
Injector Size100 lb/hr @ 58.5 PSI
Inlet / Outlet Size9/16-18 Female O-Ring (AN 6)
MAP Sensor2Bar
Max Horsepower Rating500 Naturally Aspirated
Product TypeSniper 4BBL TBI Kits
Throttle Bore1.375 Primary / 2.00 Secondary
Part Number550-868D

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
Holley EFI Dealers
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      *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

      Some parts are not legal for use in California or other states with similar regulations.