BluePrint Engines 427 c.i. GM LS Compatible Builder Series - Standard Edition - Fuel Injected - 4L65/70E Automatic Transmission - Natural Pulley Kit. (PART #BPE-BLS4278K4L7)

BluePrint’s LS-compatible 427 c.i. Builder Series package delivers massive displacement, modern reliability, and street-dominating power, paired with a 4L65/70E automatic transmission for smooth, strong, and cruise-ready performance. This standard edition setup comes fully engineered with the Holley Terminator X EFI system for precision fuel control and easy tuning, while the natural pulley kit adds a bold, performance-built finish under the hood. Designed for builders who want big LS torque and turnkey drivability, this package is ready to power anything from Pro-Touring muscle to high-end restomods.

The 2-piece BluePrint low profile intake manifold is perfect for factory or low angle hood designs and works great from 2200-8000 RPM range. The 2-piece design is perfect for periodic clean up or intake manifold porting and is capable of handling up to 600 horsepower.

Blocks:

• BluePrint Engines High Strength Cast Iron (LSX Style) Block
• Increased Deck Thickness and Strength Webbing
• Utilizes OEM LS3 Front and Rear Covers
• Improved Water Jacket Design
• Extended Cylinder Skirt
• 1-Piece Rear Main Seal
• Priority Main Oiling
• 4.0665" Bore
• 6-Bolt Main

Cylinder Heads:

• BluePrint Aluminum Cylinder Heads - PS8015
• 69cc Chamber
• 2.165" Intake / 1.590" Exhaust Valves
• 259cc Intake / 102cc Exhaust Runners

Rotating Assembly:

• Forged 6.125" Connecting Rods
• Internally Balanced Front and Rear

Included items:

• BluePrint Engines Cast Aluminum Intake Manifold
• LS Swap Oil Pan - Windage Tray - Pick Up Screen
• BluePrint Engines Fuel Injectors and Rail
• DBW Throttle Body - BPP12191019
• Throttle Pedal, and Sensors
• Spark Plugs & Wires
• Harmonic Balancer
• Coil Packs
• Natural Front Accessory Drive:
  • LT1 Style 150-amp Alternator
  • LT1 Style Water Pump
  • Type II Power Steering Pump
  • Compact Style Air Conditioner Compressor

Assembled with Complete Performance Built 4l65/70e Four Speed Automatic Transmission Package:

• 4L65/70E Complete Package
  • (1996-2008 13-Pin Harness)
• Electronic Transmission Controller Included
• 2200-2400 Stall Torque Converter
• Flex Plate
• Starter
  • First Gear Ratio: 3.059:1
  • Second Gear Ratio: 1.625:1
  • Third Gear Ratio: 1.000:1
  • Fourth Gear Ratio: 0.696:1

Holley Terminator X Max Specific Features and Benefits:

• Real Time Fuel Map Learning Simplifies Tuning by Dynamically Adjusting the Base Fuel Rate
• On Board Bosch LSU 4.9 Wideband Control, Enabling Accurate AFR Readings and Closed Loop Tuning
• Eight High Impedance Injector Drivers, Ideal for Stock LS Injectors and Holley EFI Injectors
• Integrated 1-Bar MAP Sensor for Naturally Aspirated or Nitrous Setups, with Harness Support for External Higher Bar Sensors if needed
• 4 Configurable Inputs (12V, Ground, 5V, Frequency) and 2 Outputs (Ground, PWM) - Ideal for Electric Fans, Boost Control Solenoids, Nitrous Control and more
• Free PC Tuning Software via USB/CAN Interface for Full Laptop Control and Advance Setup
• Integrated 3.5" Touchscreen Handheld with Setup Wizard, Internal Data Logging, and Real Time Gauge Displays
• Terminator X Max ECU will Include a Base Timing Map Pre-Configured for this engine.

Notes:

• Please note, It is not necessary to run the Holley setup wizard, as this will erase the existing calibration loaded by BluePrint Engines. The ecu is fully unlocked and tunable for further adjustments once installed in customer vehicle.
• Retro fit oil pan will fit most 1955-1995 GM front engine, RWD, V8 cars Not for use in pollution-controlled vehicles or in dry sump applications.
• The front accessory drive on this engine fits many vehicles, however it is the customer responsibility to accurately measure and confirm fitment. Note this is a low-profile design, but things such as power steering hoses, alternator wiring, and additional fittings/fabrication may be required on some vehicles.
• BluePrint Engines Recommends Air Intake Kit BPPLS01013 to ensure correct MAF calculations and Dyno calibration are maintained with the provided ECU / tuning.
• Engine/Trans Package Ships assembled.