BluePrint Engines BLS4278KT56 LS 427/585HP with T56, EFI, Nat.

This BluePrint Builder Series LS 427 c.i. engine and T56 manual transmission package is a high-output modern small block setup built for serious street performance with advanced EFI control and the engagement of a six-speed manual. Delivering 585 horsepower and 520 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 natural front accessory drive and a complete T56 transmission package for a powerful, responsive, swap-ready combination.

• BluePrint LS 427 delivers 585 horsepower and 520 ft.-lbs. of torque
• Holley Terminator X Max EFI system
• Forged crankshaft, forged pistons, aluminum heads, and hydraulic roller cam support a durable high-performance street build
• Natural front accessory drive
• Complete T56 six-speed transmission package includes dual-disc clutch, steel bellhousing, billet flywheel, starter, and double-overdrive gearing

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
• Forged Pistons
• Internally Balanced Front and Rear

Cylinder Heads:

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

Cam Specs:

• Hydraulic Roller
• .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:

• 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 w/ Reservoir
• Compact Style Air Conditioning Compressor 

Assembled with Complete T56 Six Speed Transmission Package:

• Includes the following: 
• McLeod Super Steel Pro Dual Disk Clutch
• Steel Bell Housing
• Billet Flywheel
• Engine Guard
• Starter

First Gear Ratio: 2.66:1

Second Gear Ratio: 1.78:1

Third Gear Ratio: 1.30:1

Fourth Gear Ratio: 1.00:1

Fifth Gear Ratio: 0.80:1

Sixth Gear Ratio: 0.63:1