Retro LS 650HP System


Part Number: 37001

In stock

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This product falls under the following Emissions Category:

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Emission Controlled Vehicle Information: Not legal for use of Emissions Controlled Vehicles. Check with your local DMV, emissions testing facility, or applicable State laws before installing. Please review your cart before checking out to make sure that your parts are legal for use in California and other states with similar regulations.


FiTech Fuel Injection introduces the Retro LS! Have you been hesitant on switching to EFI because you like the traditional look of a carburetor? Do you have a GM 4L60/80E Transmission in your hotrod? There is no more need to worry! FiTech’s Retro LS EFI 650hp fuel injection systems offer a “golden” opportunity for impressive looks and performance. These classic gold engine-toppers with transmission control are complete throttle body kits, suitable for everything from your junkyard 5.3 to a Stroker 427—and they deliver old-school carburetor looks with EFI technology and reliability. Whether a do-it-yourself hot rodder or professional EFI tuner, the features of the FiTech Retro LS EFI 650hp system are sure to inspire you. Now you can have all of the benefits of EFI yet, maintain the traditional looks of a carburetor. This system is ready to go with the needed wiring harness and sensors to get you on the road easily and faster than any system on the market today. Our system is easy to install, no computer experience required, a tight fit regulator and a hand-held tuner is included.


  • Classic gold finish for that Carburetor look with the drivability of EFI.
  • Innovative Annular discharge design.
  • Flow matched 80 lbs injectors.
  • Semi sequential fuel and full spark control.
  • Fits V8 engines from 250-650 horsepower.
  • Bosch wide band controlled.
  • Trouble-free performance with today’s fuels – put an end to vapor lock and fuel varnish problems!
  • 24x and 58x crank and cam compatible.
  • 4150 style 4BBL mounting flange – Bolts on in place of carburetor.
  • 1 BAR MAP sensor, TPS, and IAC sensor integrated onto the throttle body.
  • Fully self-tuning ECU – No laptop required.
  • Custom cam friendly.
  • Includes full color, touch screen LCD for both basic and advanced tuning options.
  • Knock sensor control.
  • Transmission control suitable for 4L60, 4L65, 4L80 GM transmissions.
  • Tight-fit regulator #54000 included.
  • Connections for Ford, GM TH350, 700R4 and other transmission linkages.
  • Easy plug and play harnesses with minimal connections.
  • Virtually maintenance free – keeps your vehicle reliable and ready to drive.
  • This system needs a fuel delivery system to provide 58 PSI of fuel pressure. A Fuel pump, fuel lines, fuel filter, and fuel pressure regulator are needed for this kit. Below is a list of fuel system components that may be needed.
    Part # Item
    50004 Go Fuel Force Fuel Surge Tank
    50005 Go Fuel Dual Pump Force Fuel Surge Tank
    50006 Go Fuel Force Fuel Mini Surge Tank
    50015 Go Fuel in Tank Fuel Pump 800 HP Module
    50019 Go Fuel in Tank Fuel Pump Returnless Module With 2 Inch Fill
    54001 Go Fuel Tight Fit Regulator with Pressure Gauge
    54002 Go Fuel Regulator with Pressure Gauge
    51003 Go Fuel AN-6 Stainless Steel 40 Ft Hose Kit with Filter
    51004 Go Fuel AN-6 Black Stainless Steel 40 Ft Hose Kit with Filter


Additional information

Weight 24 lbs
Dimensions 28 × 16 × 10 in

Additional information

Weight 24 lbs
Dimensions 28 × 16 × 10 in