The BluePrint Engines GM LS Compatible 427 C.I. Pro Series Crate Engine delivers serious LS-based performance in a complete Deluxe Dressed configuration designed for high-performance street builds, restomods, pro touring applications, and custom LS swap projects. Producing 605 horsepower and 565 ft.-lbs. of torque, this 427 cubic inch powerhouse combines LSX-style block strength, forged internal components, LS3 aluminum cylinder heads, and advanced EFI control through the included Holley Terminator X Max Gen IV EFI system.

Built around a BluePrint Engines high-strength cast iron LSX-style block, this Pro Series engine features a steel crankshaft, forged pistons, forged connecting rods, and an 11:1 compression ratio for exceptional durability and performance. The LS3-style aluminum cylinder heads and aggressive hydraulic roller camshaft provide excellent airflow and power throughout the RPM range while maintaining street-friendly drivability.

The GM Plastic Intake Deluxe Dressed package includes a complete fuel injection system, drive-by-wire throttle body, fuel rails, sensors, coil packs, spark plugs and wires, harmonic balancer, LS swap oil pan components, and a polished accessory pulley kit for a show-quality engine bay appearance. The included Holley Terminator X Max EFI system features a BluePrint Engines calibrated ECU and harness package designed specifically for this engine combination.

Perfect for Camaro, Corvette, Chevelle, Nova, G-Body, truck, and custom LS swap builds, the PSLS4273CTFK 427 C.I. Pro Series Engine delivers big-displacement power with modern LS compatibility and turnkey EFI performance.

Key Features:

• 427 C.I. GM LS Compatible Pro Series Crate Engine
• 605 Horsepower / 565 ft.-lbs. Torque
• Deluxe Dressed configuration
• GM LS3-style plastic intake manifold
• Polished accessory pulley kit
• Holley Terminator X Max Gen IV EFI system
• Complete ECU and wiring harness
• BluePrint Engines LSX-style high-strength cast iron block
• LS3 aluminum cylinder heads
• 11:1 Compression Ratio
• Forged pistons
• Steel crankshaft
• 4.125" Stroke
• 6.125" Connecting Rods
• Hydraulic roller camshaft:
  • .624" Intake Lift
  • .624" Exhaust Lift
  • 239° Intake Duration @ .050"
  • 255° Exhaust Duration @ .050"
  • 114° LSA
• Fuel injectors and fuel rails included
• Drive-by-wire throttle body
• Coil packs, spark plugs, and wires included
• LS swap oil pan, windage tray, and pickup screen included
• Requires 91+ octane fuel
• Dyno tested by BluePrint Engines

Polished Pulley Kit Includes:

• Polished LS accessory drive components
• LS2-style water pump
• 1-wire 140 amp alternator
• Peanut-style A/C compressor
• Type II power steering pump with remote reservoir
• Low-profile front accessory drive design

Fitment Applications:

Designed for custom GM performance applications including:

• Chevrolet Camaro LS Swap Builds
• Chevrolet Corvette Performance Applications
• Chevrolet Chevelle Restomod Builds
• Chevrolet Nova LS Conversions
• GM G-Body LS Swaps
• Chevrolet C10 and Truck LS Builds
• Street Rods
• Pro Touring Vehicles
• Custom Restomod Projects

Note: Vehicle-specific fitment requires verification of engine mounts, transmission compatibility, oil pan clearance, accessory spacing, and drivetrain requirements.

Installation Notes:

• Holley Terminator X Max ECU is pre-calibrated by BluePrint Engines specifically for this engine combination. Do not use standard Holley base calibrations.
• Requires a non-weighted flexplate/flywheel.
• Retro-fit oil pan fits many 1955-1995 GM front-engine, rear-wheel-drive V8 applications.
• Not intended for pollution-controlled vehicles or dry sump applications.
• Front accessory drive fitment should be verified before installation due to vehicle-specific clearance requirements.
• Compatible transmission control requires additional Holley transmission harness components.