Take your LS swap build to the next level with the BluePrint Engines GM LS Compatible 427 c.i. Engine and 4L65/70E Automatic Transmission Package. Designed for serious street performance, this complete drivetrain package delivers 585 horsepower and 520 lb-ft of torque with the reliability, drivability, and tuning capability expected from a modern LS-based combination.

The Standard Edition Builder Series 427 c.i. LS-compatible engine features a high-strength LSX-style cast iron block, BluePrint aluminum cylinder heads, forged pistons, forged crankshaft, and hydraulic roller camshaft. The included Holley Terminator X Max Gen IV EFI System provides precise fuel control, easy tuning capability, and excellent street manners.

Paired with a performance-built 4L65/70E automatic transmission, this package provides smooth shifting, electronic control, and dependable power delivery for Pro-Touring builds, restomods, classic GM muscle cars, and custom LS swap applications. The complete package ships assembled for easier installation and integration.

Key Features:

• Complete GM LS-compatible engine and automatic transmission package
• 427 cubic inch displacement
• 585 horsepower
• 520 lb-ft torque
• BluePrint Engines high-strength LSX-style cast iron block
• Increased deck thickness and reinforced block structure
• OEM LS3 front and rear cover compatibility
• BluePrint aluminum cylinder heads
• 11:1 compression ratio
• Hydraulic roller camshaft:
  • .624" intake lift
  • .624" exhaust lift
  • 239° intake duration @ .050"
  • 255° exhaust duration @ .050"
  • 114 LSA
• Forged pistons
• Forged crankshaft
• 4.125" stroke
• Forged 6.125" connecting rods
• Holley Terminator X Max Gen IV EFI System
• Complete ECU and wiring harness included
• 4L65/70E electronically controlled automatic transmission
• 2200-2400 stall torque converter
• Flexplate and starter included
• Electronic transmission controller included
• Designed for 91+ octane fuel
• Does not include front accessory drive

Fitment Applications:

• 1982-2002 Chevrolet Camaro LS swap builds
• 1982-2002 Pontiac Firebird LS swap builds
• Chevrolet Corvette LS conversions
• Chevrolet Chevelle LS conversions
• Chevrolet Nova LS conversions
• GM Pro-Touring builds
• Restomod muscle cars
• Street rods
• Custom LS-powered vehicles

Installation Notes:

• Verify engine bay clearance, transmission tunnel clearance, and accessory 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 system modifications
  • Wiring integration
• Engine/transmission package ships assembled.
• Holley EFI calibration is pre-configured by BluePrint Engines; follow BluePrint tuning recommendations rather than standard Holley base calibration procedures.