Experience big-cube LS performance with modern drivability in the BluePrint Engines GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission Package. Designed for high-performance street builds, restomods, and Pro-Touring applications, this Standard Edition Builder Series drivetrain package delivers 605 horsepower and 565 lb-ft of torque while combining forged internal components, LS3-style cylinder heads, and electronic fuel injection for dependable performance.

The 427 c.i. LS-compatible engine features a high-strength LSX-style cast iron block, forged crankshaft, forged pistons, forged connecting rods, and BluePrint aluminum LS3-style cylinder heads. The included Holley Terminator X Max Gen IV EFI System provides complete ECU control, wiring harness integration, and a calibrated fuel management system for simplified LS swap installations.

Paired with a performance-built 4L65/70E automatic transmission, this package delivers smooth electronic shifting, strong torque capacity, and turnkey convenience. The complete engine/transmission assembly is ideal for Camaro, Firebird, Corvette, classic GM muscle car, and custom LS conversion projects.

Key Features:

• Complete GM LS-compatible engine and automatic transmission package
• 427 cubic inch displacement
• 605 horsepower
• 565 lb-ft torque
• BluePrint Engines LSX-style high-strength cast iron block
• Increased deck thickness and strength webbing
• OEM LS3 front and rear cover compatibility
• Priority main oiling system
• Six-bolt main design
• Extended cylinder skirt
• 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
• Holley Terminator X Max Gen IV EFI System
• Complete ECU and wiring harness
• BluePrint calibrated EFI tuning
• GM plastic intake manifold
• Drive-by-wire throttle body
• Fuel injectors and fuel rails
• Sensors, throttle pedal, coil packs, spark plugs, and wires included
• Performance-built 4L65/70E automatic transmission
• 2200-2400 stall torque converter
• Electronic transmission controller included
• Flexplate and starter included
• Recommended fuel: 91+ octane
• Front accessory drive not included

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, transmission tunnel clearance, cooling requirements, and accessory drive needs 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 EFI ECU is fully calibrated by BluePrint Engines. Follow BluePrint calibration recommendations rather than standard Holley EFI setup procedures.
• Engine/transmission package ships assembled.
• Not intended for pollution-controlled vehicles or dry sump applications.