Supports Up To 500 HP - 3.5 in. LCD Touchscreen - For Spreadbore Manifold

Part Number: 550-869

The Sniper EFI Quadrajet™ is here to help with classic installs, perfect for not having enough hood clearance to mount an adapter or don’t want to replace your OEM spread bore intake. Our bolt-on spread bore electronic fuel injected throttle body system 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 with (4) 100 lb./hr. fuel injectors, built-in timing control, 3.5" LCD touchscreen, and much more. For power, this throttle body will support up to 500 HP naturally aspirated. In addition, 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 appearance installation. After you’ve installed your EFI, use our included 3.5" handheld to answer a few simple questions and your system will begin to self-tune with no laptop required. This can also be installed on marine applications, please refer to Tech Resources section for more information on the correct and safest way to install.

Features and Benefits

• Fits most stock Rochester Quadrajet™ (Q-Jet) air cleaners
• Certified to ISO 8846, SAE J1171, and United States Coast Guard Requirements for Ignition Protection and Fire Resistance
• 3.5” LCD handheld touchscreen for setup, tuning, gauge displays, and other viewing parameters
• Integrated ignition timing control when paired with HyperSpark line of distributors and ignition components, along with Holley Dual Sync
• Fuel pump outlet wire with built in relay to directly power the fuel pump
• Initial handheld calibration wizard creates a base tune with no laptop needed
• Included universal throttle, transmission kickdown bracket, and brake booster adapter
• Bosch LSU 4.9 Wideband Oxygen (O2) Sensor for maximum performance on real time fuel map learning
• Designed to deliver the signature Rochester Roar at wide open throttle (WOT)
• Built in Manifold Air Pressure (MAP) and Inlet Air Temperature (IAT) sensors automatically adjust to the changing conditions
• (4) 100 lb./hr. fuel injectors and 715 CFM throttle body supporting up to 500 HP naturally aspirated
• Throttle body mounted ECU for a cleaner engine bay
• 3 ground trigger outputs to control accessories such as cooling fans, AC, etc.
• Simple installation with only (4) wires including Battery+, Battery-, 12V switched ignition, and RPM signal

For marine installations, a flame arrestor is legally required. We recommend Holley P/N 720-1 or 720-11 Flame Arrestor, along with Holley P/N 720-31 or 720-33 Flame Arrestor Vent Tube to ensure proper function, safety, and compliance.