null Skip to main content
Toggle Menu Shop
Add a Vehicle
Advanced Search

Select My Store
Rochester Quadrajet (Q-Jet) 4-Barrel Fuel Injection Conversion - Self-Tuning System with Handheld EFI Controller - Classic Gold | SNI550-869
Rochester Quadrajet (Q-Jet) 4-Barrel Fuel Injection Conversion - Self-Tuning System with Handheld EFI Controller - Classic Gold | SNI550-869

Holley Sniper EFI

Rochester Quadrajet (Q-Jet) 4-Barrel Fuel Injection Conversion - Self-Tuning System with Handheld EFI Controller - Classic Gold | SNI550-869

Part #SNI550-869
$2,520.00

Fulfillment

FREE in-store pickup
* Shipping not yet available
Are you tired of rebuilding the 50+ year old Rochester™ Quadrajet® (Q-Jet™) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? Introducing Sniper EFI Quadrajet™. 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! The Sniper EFI Rochester Quadrajet™ (Q-Jet) system retains the same great features as the 4150 Sniper EFI version such as; four 100lb/hr Injectors, built-in timing control, a 3.5" full-color touchscreen, and much more! The throttle body will support up to 500 horsepower naturally aspirated. In addition to all of these great tried and true features, 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 appearing installation!
  • Available in 3 Finishes - Classic Gold, Shiny and Black Ceramic
  • 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
  • Certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance. Making Sniper EFI the perfect choice for carburetor to marine fuel injection conversions!
  • A Flame Arrestor is REQUIRED for marine installations, such as part number, 720-1 or 720-13
  • Designed to deliver the signature Rochester Roar at Wide Open Throttle!
  • Patent Pending
  • 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
Details
BrandHolley Sniper EFI
Product Dimensions 24.13 x 31.75 x 37.59 inches
Manufacturer Part Number550-869
Vehicle Fitment
Buying Online

In-store Pickup

  • In-stock items: Ready in as little as 2 hours.
  • Ship-to-store items: Ready in-store in 1 to 4 days.
We’ll keep you informed every step of the way and email you as soon as your order is ready for in-store pickup. Want more info? Visit Click and Collect.

Shipping

Coming soon! Sign up and we’ll let you know when shipping is available.

Returns

Most unopened online purchases can be returned or exchanged at any of our store locations within a year from the date of sale. Some exceptions apply. See our return policy for full details.

Related Products

Videos Hide Videos Show Videos

!

GENERAL INQUIRIES

Need help finding an item?

Ask a store representative to place a special order.