The BluePrint Engines GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission Package delivers massive LS displacement, modern EFI technology, and dependable automatic performance in a complete turnkey drivetrain package. Designed for street performance, Pro-Touring builds, restomods, and custom LS swaps, this Standard Edition Builder Series combination produces 605 horsepower and 565 lb-ft of torque while pairing a high-strength 427 c.i. LS-compatible engine with a performance-built 4L65/70E automatic transmission.

This 427 c.i. LS platform features a BluePrint LSX-style high-strength cast iron block, aluminum LS3-style cylinder heads, forged rotating assembly, 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, and BluePrint-calibrated tuning for reliable operation and simplified setup.

Finished with a Natural Pulley Kit, this package provides a clean OEM-inspired appearance while including a complete automatic transmission package with electronic controls, torque converter, flexplate, and starter. This drivetrain combination is ideal for Camaro, Firebird, Corvette, Chevelle, Nova, and other GM LS swap applications.

Key Features:

• Complete GM LS-compatible engine and automatic transmission package
• 427 cubic inch displacement
• 605 horsepower
• 565 lb-ft torque
• Standard Edition Builder Series
• Natural Pulley Kit
• Holley Terminator X Max Gen IV EFI System
• Complete ECU and wiring harness
• BluePrint calibrated EFI programming
• LSX-style high-strength cast iron block
• Increased deck thickness and reinforced strength webbing
• Extended cylinder skirt
• Priority main oiling system
• Six-bolt main design
• One-piece rear main seal
• OEM LS3 front and rear cover compatibility
• 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
• BluePrint cast aluminum intake manifold
• Drive-by-wire throttle body
• Fuel injectors and fuel rails
• Coil packs, sensors, spark plugs, and wires included
• Harmonic balancer included
• Natural front accessory drive:
  • LT1-style 150 amp alternator
  • LT1-style water pump
  • Type II power steering pump
  • Compact A/C compressor
• Performance-built 4L65/70E automatic transmission package:
  • 1996-2008 13-pin harness
  • Electronic transmission controller included
  • 2200-2400 stall torque converter
  • Flexplate included
  • Starter included
• Transmission gear ratios:
  • 1st: 3.059:1
  • 2nd: 1.625:1
  • 3rd: 1.000:1
  • 4th: 0.696:1
• 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 LS performance builds

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-calibrated ECU. Follow BluePrint calibration recommendations rather than standard Holley EFI setup procedures.
• BluePrint recommends air intake kit BPPLS01013 to maintain proper MAF calculations and dyno calibration.
• Retro-fit oil pan fits most 1955-1995 GM front-engine, rear-wheel-drive V8 applications.
• Engine/transmission package ships assembled.