The BluePrint Engines GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission Package delivers big-cubic-inch LS performance with the convenience of a complete automatic drivetrain solution. Designed for street performance, Pro-Touring builds, restomods, and LS swap applications, this Standard Edition Builder Series package produces 585 horsepower and 520 lb-ft of torque while combining a forged-internals 427 LS-compatible engine with a performance-built 4L65/70E automatic transmission.

Built around a high-strength LSX-style cast iron block, this 427 c.i. engine features BluePrint aluminum LS3-style cylinder heads, forged crankshaft, forged pistons, hydraulic roller camshaft, and an 11:1 compression ratio for exceptional street performance and durability. The included Holley Terminator X Max Gen IV EFI System provides complete ECU control, wiring harness integration, touchscreen setup features, and BluePrint-calibrated tuning for a reliable LS swap installation.

Finished with a Black Pulley Kit, this package provides an aggressive underhood appearance while including the complete transmission package, electronic transmission controller, torque converter, flexplate, and starter. This turnkey drivetrain combination is ideal for builders looking for modern LS power with dependable automatic shifting performance.

Key Features:

• Complete GM LS-compatible engine and automatic transmission package
• 427 cubic inch displacement
• 585 horsepower
• 520 lb-ft torque
• Standard Edition Builder Series
• Black Pulley Kit
• Holley Terminator X Max Gen IV EFI System
• BluePrint calibrated ECU and wiring harness
• 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
• Priority main oiling system
• Six-bolt main design
• One-piece rear main seal
• BluePrint LS3 aluminum 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
• GM plastic intake manifold
• Drive-by-wire throttle body
• BluePrint fuel injectors and fuel rails
• Coil packs, sensors, spark plugs, and wires included
• Harmonic balancer included
• Black front accessory drive:
  • LT1-style 150 amp alternator
  • LT1-style water pump
  • Type II power steering pump with reservoir
  • Compact A/C compressor
• Performance-built 4L65/70E automatic transmission package:
  • 13-pin harness (1996-2008 applications)
  • Electronic transmission controller included
  • 2200-2400 stall torque converter
  • Flexplate included
  • Starter included
• Recommended fuel: 91+ octane

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 vehicles
• Classic muscle car LS swaps
• Street rods
• Custom performance vehicles

Installation Notes:

• Verify engine bay clearance, accessory placement, transmission tunnel clearance, and cooling requirements 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 a BluePrint calibration. Do not use standard Holley EFI calibration procedures for this engine package.
• BluePrint recommends air intake kit BPPLS01013 to maintain correct MAF calculations and dyno calibration.
• Engine/transmission package ships assembled.
• Retro-fit oil pan fits most 1955-1995 GM front-engine, rear-wheel-drive V8 applications.
• Not intended for pollution-controlled vehicles or dry sump applications.