Holley Sniper TBI Master Polished Kit #550-510K

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Holley Sniper EFI 4 Barrel Fuel Injection Conversion - Self-Tuning Master Kit + Handheld EFI Monitor - Shiny Finish


Holley just brought EFI within range – introducing Sniper EFI master kits!

It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Perfect for street rods, muscle cars, off road trucks or nearly any carbureted vehicle.

The Sniper EFI master kit contains the most complete EFI fuel system on the market. Everything is included to completely plumb your fuel system including; 20 feet of 3/8” EFI Hose, in-line fuel pump, post and pre fuel filters, return bulkhead, and all of the necessary fittings and hardware.

Put an end to cold start issues, hesitations, vapor lock, and flooding. Upgrade to Sniper EFI and get the tactical accuracy of EFI today!


  • Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spread Bore manifolds - (Spread Bore Sealing Plate Part #9006 is recommended)
  • Throttle body mounted ECU – no extra boxes to mount
  • Supports up to 650hp with Four 100 Lb/Hr Injectors!
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • Includes complete fuel system consisting of; 20ft of 3/8” Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
  • Integrated ignition timing control & coil driver
  • 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 TPS/IAC and Fuel Pressure regulator, 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

Specifications :

Product Type: Fuel Injection Systems

Product Line: Holley Sniper EFI Self-Tuning Fuel Injection Systems

Injection Style: Throttle body

Fuel Injection System Type: Single 4-Barrel Throttle Body (4150 Flange)

Maximum Horsepower with Gas: 650

Timing Control Compatible: Yes

Power Adder Compatible: No

ECM Included: Yes

Self Tuning: Yes

User Tunable: Yes

Fuel Pump Included: Yes


Transmission Controller Included: No

Metering Style: Speed density

Intake Manifold Included: No

Multi-Port Fuel Rails Included: No

Throttle Body Included: Yes

Throttle Body Mounting Flange: 4-barrel square bore

Venturi Quantity: 4

Airflow Rate: 800 cfm

Fuel Pressure: 58.5 PSI

Fuel System Type: Return

Height: 3.28"

Inlet / Outlet Size: 9/16-18 Female O-Ring (AN 6)

MAP Sensor: 2Bar

Transmission: 700R4/200R4, TH350

Throttle Body Material: Cast aluminum

Throttle Body Finish: Polished

Injectors Included: Yes

Injector Size: 100 lbs./hr.

Calibration Module Included: Yes

Wiring Harness Included: Yes

Oxygen Sensor Included: Yes

Fuel Pressure Regulator Included: Yes

Distributor Included: No

MAP Sensor Included: Yes

IAT Sensor Included: Yes

TPS Sensor Included: Yes

IAC Motor Included: Yes

Quantity: Sold as a kit.

Notes: Kit includes 4 injectors and can support up to 650 hp. Master kit includes inline fuel pump, filters, hose, hardware and fittings.


More Information
Part Type Fuel Injection
Product Line Air & Fuel Delivery
Brand Holley Sniper
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