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Holley Stealth 4150 Super Sniper 1250 - Black Finish


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Holley Stealth 4150 Super Sniper 1250 - Black Finish


  • Bolt on 4150 Flange Carburetor Replacement
  • Throttle body mounted ECU – no extra boxes to mount
  • Supports up to 1250hp with Eight 100 Lb/Hr Injectors!
  • Includes high pressure fuel crossover line
  • All of the wiring exits below the rear fuel injector cover, for a completely stealth installation.
  • Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor.
  • • Programmable inputs and outputs
  • • Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors
  • • Six Programmable Ground Outputs
  • • One +5v Reference Output - +5V Power Supply for 0-5v Sensors
  • • One Sensor Ground – Ground supply for 0-5v Sensors
  • Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions.
  • Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886.
  • Integrated ignition timing control
  • 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 real-time Fuel Map Learn!
  • OEM Style TPS/IAC and Fuel Pressure regulator, for years of dependable service.
  • available in 3 finishes: Shiny, Black and coming soon, Gold
  • Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange

Every Sniper EFI Throttle Body that ships from Steve Morris Engines is tested on our in house run stand to guarantee functionality before going to our customers.

NOTE:  When ordering this EFI system, please make sure you have the proper fuel pump, boost-referenced pressure regulator, carb hat, etc.  In the pull-down menu below, we recommend the HOLLEY regulator and fuel pump as seen here:

Add SME Boosted calibration? MUST SHIP FROM SME:
Add Second Calibration?:
Add 4150 Carb Hat?:
Add complete fuel system with pump, reg, filter and fittings.:

Engine Type (SBC, BBC, etc)? *

Engine Displacement? *

MAX Engine RPM? *

Camshaft details *

Do you want the SNIPER to control engine timing? (MUST use MSD box or Hyperspark box) *

What power-adder will you be using? *

Max boost? *

Which ignition box? *

Is it intercooled? *

Part #: 550-877

Price: $1,649.95

Product Q & A

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