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Holley Sniper Efi Quadrajet - Black

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Tired of overhauling the 50+ year old Rochester™ Quadrajet® (Q-Jet™) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? Enter the Sniper EFI Quadrajet™, a revolutionary bolt-on spreadbore electronic fuel-injected throttle body system that eliminates the need for extra adapters, sealing plates, or intake manifold swaps! This cutting-edge system, specifically designed for the Rochester Quadrajet™ (Q-Jet), preserves the acclaimed features of the 4150 Sniper EFI version, including four 100lb/hr Injectors, built-in timing control, a 3.5" full-color touchscreen, and more. Supporting up to 500 horsepower naturally aspirated, this throttle body maintains compatibility with most stock air cleaners and offers various fuel inlet configurations for a seamlessly integrated appearance.

When upgrading to EFI, Sniper stands out as the premier choice, requiring just four simple connections for a hassle-free installation. Engineered for at-home setup in your garage with minimal tools, Sniper ensures improved engine performance, enhanced MPG, and easier starting. The user-friendly calibration wizard initiates the self-tuning process, allowing you to answer a few questions about your engine without the need for a laptop. You don't need to be a tech expert or tuning specialist to navigate the Sniper EFI system. The high-resolution 3.5" full-color touchscreen facilitates tuning and gauge displays.

Sniper EFI is more than a standalone system; it's part of a comprehensive ecosystem. Seamlessly integrate your new Sniper kit with Holley's Sniper Hyperspark Ignition, Fuel Systems, Air Cleaners, Throttle Body, and Digital Dash to unleash the full potential of your vehicle. Complete your fuel injection journey by exploring our range of ignition, fueling, and accessory options!


  • Compatible with most stock Rochester Quadrajet™ (Q-Jet) air cleaners
  • Self-tuning ECU for hassle-free operation, no advanced computer/tuning skills required
  • Simple Calibration Wizard for easy setup without a laptop
  • Only 4 Wiring Connections Required (Battery +, Battery -, Switched Ignition & RPM)
  • High-Resolution Full-Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Throttle body-mounted ECU eliminates the need for extra mounting boxes
  • Captures the distinctive Rochester Roar at Wide Open Throttle
  • Supports up to 500hp with Four 100 Lb/Hr Injectors
  • Integrated ignition timing control
  • Transmission provisions on throttle lever for TH350/TH400 and 200R4/700R4
  • Brake Booster adapter included if necessary
  • Universal Throttle and transmission kickdown bracket included
  • Genuine Bosch LSU 4.9 Wideband Oxygen Sensor for real-time Fuel Map Learn
  • OEM Style Throttle Position Sensor (TPS) and Idle Air Control (IAC) for reliable service
  • Clamp-on oxygen sensor kit ensures a leak-free 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
  • Certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance, making it ideal for marine fuel injection conversions
  • Flame Arrestor required for marine installations, part numbers 720-1 or 720-13
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