The BluePrint Engines GM LS Compatible 427 c.i. Engine and T56 Manual Transmission Package combines big-cubic-inch LS performance with the driver engagement of a six-speed manual transmission. Built for enthusiasts who want complete control of every shift, this Standard Edition Builder Series drivetrain delivers 585 horsepower and 520 lb-ft of torque with modern EFI technology and proven LS architecture.

At the heart of this package is a 427 cubic inch LS-compatible engine featuring a high-strength LSX-style cast iron block, BluePrint aluminum LS3-style cylinder heads, forged rotating assembly, and hydraulic roller camshaft. The included Holley Terminator X Max Gen IV EFI System provides complete ECU and harness integration for reliable fuel management and simplified tuning.

Finished with a Natural Pulley Kit, this engine package offers a clean, classic underhood appearance while delivering modern LS swap performance. The included T56 six-speed manual transmission makes this combination ideal for Pro-Touring builds, muscle car restorations, street performance vehicles, and custom LS swaps.

Key Features:

• Complete GM LS-compatible engine and T56 manual transmission package
• 427 cubic inch displacement
• 585 horsepower
• 520 lb-ft torque
• Standard Edition Builder Series configuration
• Natural Pulley Kit
• BluePrint Engines LSX-style high-strength cast iron block
• Increased deck thickness and strength webbing
• OEM LS3 front and rear cover compatibility
• Improved water jacket design
• Extended cylinder skirt
• One-piece rear main seal
• Priority main oiling system
• Six-bolt main design
• BluePrint aluminum LS3-style cylinder heads
• 11:1 compression ratio
• Forged rotating assembly:
  • Forged crankshaft
  • Forged pistons
  • Forged 6.125" connecting rods
• 4.125" stroke crankshaft
• Hydraulic roller camshaft:
  • .624" intake lift
  • .624" exhaust lift
  • 239° intake duration @ .050"
  • 255° exhaust duration @ .050"
  • 114 LSA
• Holley Terminator X Max Gen IV EFI System
• Complete ECU and wiring harness
• BluePrint calibrated EFI programming
• Natural finish accessory drive components
• T56 six-speed manual transmission
• Manual transmission clutch package
• Bell housing included
• Flywheel included
• Starter included
• Recommended fuel: 91+ octane
• Front accessory drive included with this configuration

Fitment Applications:

• 1982-2002 Chevrolet Camaro LS swap builds
• 1982-2002 Pontiac Firebird LS swap builds
• Chevrolet Corvette LS conversions
• Chevrolet Chevelle restomod builds
• Chevrolet Nova LS conversions
• GM Pro-Touring builds
• Classic muscle car LS swaps
• Street rods
• Custom LS performance vehicles

Installation Notes:

• Verify engine bay clearance, transmission tunnel clearance, and shifter placement before installation.
• Additional swap components may be required depending on vehicle application:
  • Engine mounts
  • Transmission crossmember
  • Driveshaft modification
  • Cooling system upgrades
  • Fuel system upgrades
  • Exhaust modifications
  • Wiring integration
• Holley Terminator X EFI system includes BluePrint calibration for this engine combination.
• High-performance drivetrain components are recommended for vehicles using the engine’s full power capability.
• Professional installation is recommended for custom LS swap applications.