Holley Squarebore 4150/4160

If you've landed here, you're lucky enough to have the most versatile flange in the Sniper EFI lineup. From mild to wild, we have all of the bases covered. We have two standard Sniper EFI systems that come equipped with four 100 lb/hr injectors that will support up to 650 horsepower. This includes the base Sniper EFI and the Sniper EFI Stealth for those of you who want to maintain the classic looks of the squarebore carburetor you're replacing. These do come equipped with a 2 bar MAP sensor that will handle up to 14.7 psi of boost as well. Despite the aesthetic differences, these units are internally identical so their is no tradeoff for looks vs. power.

If your goals exceed 650 horsepower and/or boost levels over 14.7 psi, we have even more options for you. The Super Sniper 650, Super Sniper 1250, Sniper XFlow, Sniper XFlow 1375, Super Sniper Stealth 650, and Super Sniper Stealth 1250 all come equipped with a 2.5 bar MAP sensor that will handle 21.5 psi of boost and support up to 1375 horsepower.

But don't think we forgot about the dual quad guys either! If you're running a tunnel ram, roots style blower, or other 2x4 intake, we have a lineup of Sniper EFI systems engineered specifically for you.
 

Sniper EFI

If you're staying under 650 horsepower and are naturally aspirated, you have two distinct choices with equal performance. While very different looking in the visual department, both the standard Sniper EFI and the Sniper EFI Stealth are identical on the inside and in terms of performance. The only question you need to ask is whether you want a little more modern look under your air cleaner or if you want to fool people into thinking that 4150 is still being fed 3-7 psi from an engine-mounted mechanical fuel pump.
 

Sniper EFI 4150

  • Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spreadbore manifolds - (Spreadbore Sealing Plate Part #9006 is recommended)
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
  • Supports up to 650 horsepower with four 100 lb/hr injectors
     

Sniper EFI Stealth 4150

  • Bolt on 4150 Flange Carburetor Replacement
  • Gives your engine bay a classic look with modern performance
  • 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.
  • Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions.
  • An external fuel pressure regulator is required, set to a base pressure of 58.5 PSI e.g. part # 12-886.
     

Super Sniper EFI

If you've surpassed the capabilities of our standard Sniper EFI systems, we have several choices in our Super Sniper and XFlow lineups to support up to 1375 horsepower! We even have a Super Sniper Stealth to help you maintain a classic look in your engine bay while supporting up to 1250 horsepower. Check out the sections below to see which Sniper EFI System best suits your application.
 

Super Sniper EFI 650

Super Sniper EFI 650

  • 650 HP version features four 100 Lb/Hr Injectors
  • Compatible with Draw-Thru or Blow-Thru forced induction applications
  • User-friendly Boost Control with handheld adjustability
  • Programmable Target Air Fuel Ratios per Boost level
  • Advanced boost control is available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time – Same popular boost control offered in Holley HP and Dominator EFI systems!
  • 2.5 Bar MAP sensor included which safely works on applications up to 21.5 PSI
  • Dry or Wet Nitrous Support
  • Built-in Single stage progressive nitrous control
  • Progressive or Non-Progressive control strategies
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
     
Super Sniper EFI 1250

Super Sniper EFI 1250

  • 1250 HP version features eight 100 Lb/Hr Injectors (Forced Induction)
  • The 800 CFM Main Body will support 650 Horsepower Naturally Aspirated and up to 1250 in boosted applications
  • Compatible with Draw thru or blow thru forced induction applications
  • Built-in Single stage progressive nitrous control
  • Programmable inputs and outputs
  • Integrated ignition timing control for precise timing curves
  • User-friendly Boost Control with handheld adjustability
  • Programmable Target Air Fuel Ratios per Boost level
  • Advanced boost control is available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time – Same popular boost control offered in Holley HP and Dominator EFI systems!
  • 2.5 Bar MAP sensor included which safely works on applications up to 21.5 PSI
  • Built-in Single stage progressive nitrous control
  • Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors
  • Six Programmable Ground Outputs
  • One Sensor Ground – Ground supply for 0-5v Sensors
  • Internal fuel pressure regulator eliminates the hassle of plumbing an external fuel pressure regulator (Preset to 58.5 PSI)
     
Super Sniper EFI Stealth 650

Super Sniper EFI Stealth 650

  • Supports up to 650hp with Four 100 Lb/Hr Injectors
  • 2.5 Bar MAP sensor supports up to 21.5 psi of boost
  • 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.
  • 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.
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI e.g. part # 12-886.
     
Super Sniper EFI Stealth 1250

Super Sniper EFI Stealth 1250

  • Supports up to 650 hp naturally aspirated and 1250hp in boosted applications with Eight 100 Lb/Hr Injectors
  • 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
  • External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
  • 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.
     
Sniper XFlow

Sniper XFlow

  • The base Sniper XFlow supports up to 800 horsepower in all applications with four 120 lb/hr injectors
  • The Sniper XFlow 1375 supports up to 800 horsepower naturally aspirated and 1375 horsepower in forced induction applications with eight 120 lb/hr injectors
  • Compatible with Draw through or Blow through forced induction applications
  • 2.5 Bar MAP Sensor can handle up to 21.5 psi of boost
  • Built in Single stage progressive nitrous control
  • User friendly Boost Control with handheld adjustability
  • Programmable Target Air Fuel Ratios per Boost level
  • Advanced boost control available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time.
  • 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
  • Dual Pattern bolt on carburetor replacement, designed to fit 4150 Flange & Spread Bore manifolds - (Spread Bore Sealing Plate Part #9006 is recommended)
  • Requires an external fuel pressure regulator: P/N 12-848 up to 800 HP or 12-851 for 1000+ HP.
     

Sniper EFI 2x4

If your tunnel ram, roots style blower, or other dual quad manifold is the focal point of your engine bay but you want the modern performance capabilities of EFI, our 2x4 Sniper EFI systems are exactly what you need to have your cake and eat it too. Both systems are capable of supporting up to 1250 horsepower, so the only question you need to answer is whether or not forced induction is a part of your combination.

Sniper EFI 2x4
  • A combined eight 100 lb/hr injectors between the two throttle bodies supports up to 1250 horsepower for both the Sniper EFI 2x4 and the Super Sniper 2x4
  • The Super Sniper 2x4 has an integrated 2.5 Bar MAP sensor capable of handling up to 21.5 psi of boost
  • Built in Single stage progressive nitrous control
  • The Super Sniper 2x4 system has programmable target air fuel ratios & ignition timing per Boost level
  • Fits on intake manifolds with flange spacing between 6.43"-13.5" (Includes most Edelbrock Manifolds)
  • Requires an external fuel pressure regulator: P/N 12-848 up to 800 HP, 12-851 for 1000+ HP
     

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