The BluePrint Engines GM LS Compatible 427 C.I. Pro Series Crate Engine delivers serious LS-based performance with a complete Deluxe Dressed configuration designed for high-performance street builds, restomods, and custom LS swap applications. Producing 585 horsepower and 520 ft.-lbs. of torque, this 427 cubic inch powerhouse combines LSX-style durability with modern EFI technology through the included Holley Terminator X Max Gen IV EFI system.

Built around a high-strength LSX-style cast iron block, this Pro Series engine features BluePrint LS3 aluminum cylinder heads, forged pistons, a steel crankshaft, forged rods, and an aggressive hydraulic roller camshaft designed to provide exceptional airflow and power throughout the RPM range. With an 11:1 compression ratio, this engine delivers outstanding performance while remaining compatible with premium pump fuel.

The Deluxe Dressed package includes a complete accessory drive system with a polished pulley kit, making it an excellent choice for builders looking for both performance and show-quality appearance. The included Holley Terminator X Max EFI system provides advanced tuning capability, integrated diagnostics, and a pre-calibrated ECU/harness package engineered specifically for this BluePrint Engines combination.

Whether you're building a Camaro, Corvette, Chevelle, Nova, G-Body, truck, or custom LS swap vehicle, the PSLS42781CTFK 427 C.I. Pro Series Engine delivers big-block power in a modern LS-compatible package.

Key Features:

• 427 C.I. GM LS Compatible Pro Series Crate Engine
• 585 Horsepower / 520 ft.-lbs. Torque
• Deluxe Dressed configuration
• Polished accessory pulley kit
• Holley Terminator X Max Gen IV EFI system
• Complete ECU and wiring harness
• LSX-style high-strength cast iron block
• BluePrint 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
• 91+ octane fuel recommended
• Dyno tested by BluePrint Engines

Polished Pulley Kit Includes:

• Polished LS accessory drive components
• Low-profile front accessory drive design
• Alternator
• Power steering pump provisions
• A/C compressor provisions
• Water pump assembly

Note: Accessory clearance varies by vehicle. Verify radiator, hood, steering, and chassis clearance before installation.

Fitment Applications:

Designed for custom GM performance builds 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 & Truck LS Builds
• Street Rods
• Pro Touring Vehicles
• Custom Performance Vehicles

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

Installation Notes:

• Holley Terminator X ECU is calibrated by BluePrint Engines specifically for this engine combination. Do not use standard Holley base calibrations.
• Front accessory drive fitment must be verified before installation.
• 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.
• Requires compatible LS transmission, flexplate/flywheel, starter, fuel system, and drivetrain components.