BluePrint Engines BLS4273KB4L7 LS 427 with 4L65/70E, EFI, Blk.

This BluePrint Builder Series LS 427 c.i. engine and 4L65/70E automatic transmission package is a high-output modern small block setup built for serious street performance with advanced EFI control and complete swap-ready convenience. Delivering 605 horsepower and 565 ft.-lbs. of torque, it combines forged internals, BluePrint aluminum heads, a hydraulic roller cam, and the Holley Terminator X Max EFI system with a black front accessory drive and a complete 4L65/70E transmission package for a powerful, responsive combination designed for hard acceleration and overdrive cruising.

• BluePrint LS 427 delivers 605 horsepower and 565 ft.-lbs. of torque
• Black front accessory drive
• Holley Terminator X Max EFI
• Forged crankshaft, forged pistons, aluminum heads, and hydraulic roller cam 
• Complete 4L65/70E automatic transmission package includes electronic controller, torque converter, flexplate, and starter for strong performance with overdrive cruising

Block:

• 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

Rotating Assembly:

• Forged Crankshaft
• 4.125" stroke
• Forged 6.125" Connecting Rods w/ 150,000 PSI Bolts
• Forged Pistons
• Internally Balanced Front and Rear

Cylinder Heads:

• BluePrint Aluminum Cylinder Heads - PS8015
• 70cc Chamber
• 2.165" Intake - 1.600" Exhaust Valves
• 259cc Intake - 102cc Exhaust Runners

Cam Specs:

• Hydraulic Roller Cam
• .624 Intake - .624 Exhaust Lift
• 239 Intake - 255 Exhaust Duration
• @.050-114 Degree Lobe Separation

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

Also Includes:

• LS Swap Oil Pan - Windage Tray - Pick Up Screen
• BluePrint Engines Fuel Injectors and Rail
• DBW Throttle Body - BPP12191019
• Throttle Pedal, and Sensors
• GM Plastic Intake Manifold
• Spark Plugs & Wires
• Harmonic Balancer
• Coil Packs 
• Black 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