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

Built around a BluePrint Engines high-strength LSX-style cast iron block, this Pro Series engine features a forged steel crankshaft, forged pistons, forged connecting rods, and an internally balanced rotating assembly for exceptional durability. The 11:1 compression ratio, LS3-style aluminum heads, and hydraulic roller camshaft provide outstanding airflow and power potential while maintaining street-friendly drivability with premium pump fuel.

The GM Plastic Intake Deluxe Dressed package includes a complete ready-to-run engine setup with Holley Terminator X Max EFI, ECU and harness, GM plastic intake manifold, fuel injectors, fuel rails, drive-by-wire throttle body, throttle pedal and sensors, coil packs, spark plugs and wires, harmonic balancer, and LS swap oil pan components. The included black pulley kit adds a clean, aggressive engine bay appearance with modern LS accessory functionality.

Perfect for Camaro, Corvette, Chevelle, Nova, G-Body, truck, and custom LS swap builds, the PSLS4273CTFKB 427 C.I. Pro Series Engine delivers big displacement horsepower with modern LS compatibility, EFI control, and turnkey installation components.

Key Features:

• 427 C.I. GM LS Compatible Pro Series Crate Engine
• 605 Horsepower / 565 ft.-lbs. Torque
• Deluxe Dressed configuration
• GM plastic LS3-style intake manifold
• Black pulley accessory kit
• Holley Terminator X Max Gen IV complete ECU/harness EFI system
• BluePrint Engines LSX-style high-strength cast iron block
• LS3 aluminum cylinder heads
• 11:1 Compression Ratio
• Forged 22cc dish pistons
• Steel crankshaft
• 4.125" Stroke
• 6.125" Forged Connecting Rods
• Hydraulic roller camshaft:
  • .624" Intake Lift
  • .624" Exhaust Lift
  • 239° Intake Duration @ .050"
  • 255° Exhaust Duration @ .050"
  • 114° LSA
• 58x crankshaft reluctor / 4x cam sensor configuration
• Drive-by-wire throttle body
• 42 lb. fuel injectors
• Fuel rails included
• 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

Black Pulley Kit Includes:

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

Fitment Applications:

Designed for custom GM performance applications including:

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

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

Installation Notes:

• Holley Terminator X Max ECU is fully 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 most 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.
• Holley Terminator X Max supports transmission control with additional transmission harness components.