By Vinny Perozzi

Holley/MSD releases the Sniper EFI Systems for Quadrajet applications, which eliminate the need to continually rebuild 50-plus-year-old Quadrajet carburetors on classic Chevys, Pontiacs, Buicks, Oldsmobiles, and GMCs. Able to support up to 500 naturally aspirated horsepower with four 100 pound-per-hour injectors, it’s the first bolt-on spread-bore electronic fuel-injected throttle-body system that doesn’t require additional adapters, sealing plates, or intake manifold swaps.

The Sniper EFI Quadrajet system boasts the same great features as the 4150 Sniper EFI version – a 3.5-inch full-color touchscreen for initial setup, tuning, and gauge displays, multiple fuel-inlet configurations for a totally stock appearance, and integrated timing control – and it’s compatible with most stock air cleaners. Installation doesn’t get any easier, and with the throttle-body-mounted ECU there are no extra boxes to mount. Just four wiring connections are required – battery positive, battery negative, switched ignition, and RPM – and a calibration wizard takes care of everything (no laptop required). Just answer a few basic questions about your engine using the touchscreen, and the calibration wizard creates a base map and starts tuning on its own.

Features:

• Designed to deliver the signature Rochester Roar at Wide Open Throttle!
• 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!
• 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