The Sniper EFI 2GC Large Bore is a bolt-on electronic fuel injection replacement for the Rochester 2GC Large Bore two-barrel carburetor found on many 1974-1978 GM vehicles. It installs directly to the factory intake manifold with no adapter required and accepts most factory air cleaners, ending cold start issues, hesitation, vapor lock, and flooding while improving throttle response and fuel economy.
Key Features:
- Only 4 wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
- Installs directly to the factory Rochester 2GC large bore intake manifold, no adapter required
- Designed to fit most factory Rochester 2GC large bore air cleaner assemblies
- Bolt-on Rochester 2GC large bore two-barrel carburetor replacement
- Throttle body mounted ECU, no extra boxes to mount
- Self-tuning ECU means no computer or tuning experience is required
- High resolution full color touchscreen for initial setup, tuning, and gauge displays
- Genuine Bosch LSU 4.9 wideband oxygen sensor provides real-time fuel map learning
- Included clamp-on oxygen sensor kit for 2.0" exhaust with stainless steel T-bolt clamps and a weldable stainless steel O2 flange
- Engineered to fit 1974-1978 GM vehicles that used the Rochester 2GC large bore carburetor
- Supports up to 350 HP with two 100 lb/hr injectors
- Universal throttle lever with TH350, 700R4, and 200-4R kickdown provisions
- Simple Calibration Wizard builds a base map and starts tuning automatically, no laptop required
Specifications:
- Injector Size: 100 lb/hr @ 58.5 PSI (two injectors)
- Inlet/Outlet Size: 9/16-18 Female O-Ring (AN 6)
- Fuel Pressure: 58.5 PSI
- Finish: Classic Gold
- Part Number: 550-857
Fits 1974-1978 Chevrolet, GMC, Oldsmobile, and Pontiac vehicles that came with a Rochester 2GC Large Bore carburetor, including Camaro, Firebird, El Camino, Corvette, Omega, and C-10 through K3500 series trucks.
FAQ
What vehicles fit the 550-857 Sniper EFI 2GC conversion?
It fits 1974-1978 Chevrolet, GMC, Oldsmobile, and Pontiac vehicles that came with a Rochester 2GC Large Bore carburetor, including Camaro, Firebird, El Camino, Corvette, Omega, and C-10 through K3500 series trucks.
How much horsepower does this system support?
Up to 350 HP with the included two 100 lb/hr injectors.
Do I need an intake adapter to install this?
No, it installs directly to the factory Rochester 2GC large bore intake manifold with no adapter required.
Will my factory air cleaner still fit?
Yes, it's designed to fit most factory Rochester 2GC large bore air cleaner assemblies.
Does this system support automatic transmission kickdown?
Yes, the universal throttle lever includes kickdown provisions for TH350, 700R4, and 200-4R transmissions.