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Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866

Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866
Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866
$2,131.99 ea
NEWARRIVING SOONEstimated Ship Date 05/29/2025 (If Ordered Today)21 Available from HOLLEY PERFORMANCE PRODUCTS as of 05/09/2025
Model: 4008255
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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Let's face it, you love driving your classic car, but dread the hassles with your Rochester 2GC carburetor. Today's fuels are blended for modern fuel injection, not that old 2Jet carburetor from 50+ years ago. Holley makes it easy to convert your classic car with a small bolt pattern, two-barrel, Rochester 2GC carb to fuel injection. The Sniper EFI 2GC Small Bore is a bolt on electronic fuel injection system that will put the fun back in your classic ride. The Rochester 2GC small bore carburetor was commonly used on 1955 - 1969 Chevrolet and Buick, Oldsmobile, and Pontiac vehicles such as the Camaro, Electra, Super 88, Tempest and most C-10 through K3500 series trucks. Installation of the Sniper EFI 2GC Small Bore throttle body is simple and straightforward:  Remove your current carburetor and bolt on the new Sniper EFI system. No intake manifold adapters required!  Reinstall your factory or custom air cleaner. The Sniper EFI 2GC air cleaner flange matches the Rochester 2GC so it accepts most factory air cleaners. Not only does the Sniper EFI 2GC offer superior throttle response and WOT power over the carburetor, but you may also benefit from increased fuel economy! Put an end to cold start issues, hesitations, vapor lock, and flooding with the accuracy of EFI. You can also use the Sniper EFI 2GC to control the ignition timing, taking EFI to the next level. The Sniper EFI 2GC system is capable of supporting 350 HP on naturally aspirated engines. Upgrade to Sniper EFI today!
Features:
  • Included clamp-on oxygen sensor kit for 2.0" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
  • Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
  • Supports up to 350HP with Two 100lb/hr Injectors
  • Integrated ignition timing control (with Holley Hyperspark, Holley Dual Sync or MSD Pro Billet distributors)
  • High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
  • Bolt on Rochester 2GC small bore two barrel carburetor replacement
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • Installs directly to the factory Rochester 2GC small bore intake manifold, no adapter required
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
  • The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn!
  • Throttle body mounted ECU – no extra boxes to mount
  • 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!
  • OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
  • Engineered to fit 1955-1969 GM vehicles that utilized the Rochester 2GC small bore carburetor
  • Designed to fit most factory 2GC air cleaner assemblies
  • Not designed for Tri-Power installations.
  • Universal throttle lever with TH350, 700R4 & 200-4R kick down provisions

Downloads:

Download Name File Size
199r11366.pdf1.59MB
199r11772.pdf5.51MB

Videos:

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Submodel Years Engine
Chevrolet Chevy II Base 1963 4.6L / 283 / V8
Chevrolet Chevy II Base 1964 4.6L / 283 / V8
Chevrolet Chevy II Base 1965 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Base 1966 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Base 1967 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Nova SS 1964 4.6L / 283 / V8
Chevrolet Chevy II Nova SS 1965 4.6L / 283 / V8
Chevrolet Chevy II Nova SS 1966 4.6L / 283 / V8
Chevrolet Chevy II Nova SS 1967 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Nova 1963 4.6L / 283 / V8
Chevrolet Chevy II Nova 1964 4.6L / 283 / V8
Chevrolet Chevy II Nova 1965 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Nova 1966 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Nova 1967 4.6L / 283 / V8
5.3L / 327 / V8
Chevrolet Chevy II Nova 1968 5.7L / 350 / V8
5.0L / 307 / V8
5.3L / 327 / V8
Chevrolet Nova Base 1969 5.7L / 350 / V8
5.0L / 307 / V8

Specifications:

Emission Code 3
Finish Classic Gold
Fuel Pressure 58.5 PSI
Injector Size 100 lb/hr @ 58.5 PSI
Inlet / Outlet Size 9/16-18 Female O-Ring (AN 6)
Part Type Fuel Injection Conversion Kit
Product Type Sniper EFI 2GC Small Bore
Proposition 65 www.P65Warnings.ca.gov

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Holly Sniper EFI Holley 2GC Small Bore, Classic Gold 550-866: