Holley Sniper EFI Quadrajet™ Master Kit - Classic Gold 550-869K
Type: Sniper EFI Quadrajet Master Kit
Are you tired of rebuilding the 50+ year old Rochester™ Quadrajet® (Q-Jet™) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? The Sniper EFI Quadrajet™ is here to help! The first bolt-on spreadbore 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! This 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!
When it comes to converting to EFI, Sniper is the absolute best way to upgrade your car to fuel injection with just 4 simple connections required. Sniper is designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. An afternoon in the garage and you will be enjoying improved engine performance, better MPG's and easier starting. After the simple installation it's time to let your Sniper begin the self-tuning process. Our user-friendly calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. You don't have to be a computer wiz or specialize in tuning to use a Sniper EFI system! Use the high resolution 3.5" full color touchscreen for tuning and gauge displays.
The Sniper EFI Master Kit includes a complete fuel system consisting of; 20ft of 3/8" vapor guard fuel hose, fuel pump, filters, and all necessary hardware to return fuel into your tank. Additionally, you're getting a 4.9 wideband oxygen sensor with a leak free oxygen sensor, oem style TPS/IAC, fuel pressure regulator, all Stainless Steel T-Bolt clamps and a Stainless Steel weldable flange.
Sniper EFI is part of a complete ecosystem! Your new Sniper kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build. Complete your fuel injection journey by checking out our full offer of ignition, fueling and accessories!
Features:
- Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI!
- 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!
- Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
- High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays.
- Supports up to 500hp with Four 100 Lb/Hr Injectors!
- Patent Pending
- Transmission provisions on throttle lever for TH350/TH400 and 200R4/700R4
- Designed to deliver the signature Rochester Roar at Wide Open Throttle!
- Throttle body mounted ECU – no extra boxes to mount
- Fits most stock Rochester Quadrajet™ (Q-Jet) air cleaners
- Complete fuel system includes – external fuel pressure regulator preset to 58.5psi, 20ft of 3/8” Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
- 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.
- Complete fuel system includes – external fuel pressure regulator preset to 58.5psi, 20ft of 3/8" Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
Specs:
- Accelerometer Support: No
- Boost Control: No
- Brand: Holley Sniper EFI
- CAN-BUS Support: No
- Category: Air and Fuel Delivery
- CFM: 715
- Coast Guard Approved: Yes
- Coil Per Cylinder Ignition Support: No
- Datalogging Support: Yes
- Distributor Included: No
- Dry Nitrous Control: Yes
- e85 Support: No
- EGT Support: No
- Emission Code: 3
- Finish: Classic Gold
- Flange Style: Spreadbore
- Forced Induction Support: Yes
- Fuel Filter Included: Yes
- Fuel Hose Included: Yes
- Fuel Injectors Included: Yes
- Fuel Pressure: 58.5 PSI
- Fuel Pressure Regulator Included: Yes
- Fuel Pump Flow Rating: 240 LPH
- Fuel Pump Included: Yes
- Fuel Pump Type: Inline
- Grade Type: Performance
- Height: 3.28"
- Ignition Timing Control: Yes
- Individual Cylinder Fuel Corrections: No
- Injector Size: 100 lb/hr @ 58.5 PSI
- Inlet / Outlet Size: 9/16-18 Female O-Ring (AN 6)
- Intake Manifold Included: No
- Knock Retard Support: No
- MAP Sensor: 2 Bar
- Max Horsepower Rating: 500 Naturally Aspirated
- Multi-Stage Nitrous Control: Yes
- Part Type: Fuel Injection Conversion Kit
- Product Type: Sniper EFI Quadrajet Master Kit
- Progressive Nitrous Control: Yes
- Self-Tuning: Yes
- Sub Category: Service Kits
- Throttle Bore: 1.375 Primary / 2.00 Secondary
- Throttle Position Sensor Included: Yes
- Traction Control Support: No
- Transmission: 700R4/200R4
- User-Tuneable: Yes
- Wet Nitrous Control: Yes
Tech Resources:
Hurry Up! Only 45 items left in stock!
Copy link:
Share:
Shipping
We strive to provide fast and reliable shipping options for all our customers. For detailed information about our shipping rates, delivery times, and policies, please visit our Shipping Page.
Return Policies
Your satisfaction is important to us. If you wish to return an item or request a refund, please review the terms and conditions outlined in our Returns Policy.
Important Notices
- Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.
