If you’re tired of rebuilding the 50+ year old Quadrajet on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac, the Sniper EFI Quadrajet from Holley is your solution.
The 550-869 is 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. This system retains the same great features as the 4150 Sniper EFI, including four 100 lb./hr. injectors, integrated timing control, and a 3.5” full-color touchscreen! The throttle body will support up to 500 horsepower naturally aspirated.
Holley’s patent-pending Sniper EFI Quadrajet will fit most stock air cleaners and offers multiple fuel inlet configurations.
Features
- Throttle body–mounted ECU (no extra boxes to mount).
- Supports up to 500 HP with four 100 lb./hr. injectors.
- Only four wiring connections required (battery+, battery- , switched ignition & RPM).
- Integrated ignition timing control.
- Transmission provisions on throttle lever for TH350/TH400 and 200R4/700R4.
- Brake booster adapter and universal throttle and transmission kickdown bracket included.
- High-resolution, full-color touchscreen; simple calibration wizard; and self-tuning ECU—no laptop required.
- Fits most stock Quadrajet air cleaners.
- Genuine Bosch LSU 4.9 wideband oxygen sensor provides real-time fuel map learn.
- Clamp-on oxygen sensor kit ensures a leak-free oxygen sensor installation.
- OEM-style TPS/IAC and fuel pressure regulator.
- Requires external fuel pressure regulator (e.g., Holley #12-886 or #12-879).
