Hawks Motorsports proudly offers the BluePrint Engines PSLS42730CT GM LS Compatible 427 C.I. Pro Series Engine, a high-performance LS-based crate engine designed for serious street machines, Pro Touring builds, muscle cars, restomods, and custom LS swap applications. Delivering an impressive 605 horsepower and 565 lb-ft of torque, this 427 cubic inch Pro Series engine combines modern LS architecture with premium internal components for exceptional power and reliability.

Built around a BluePrint high-strength LSX-style cast iron block, this engine features increased deck thickness, reinforced strength webbing, improved water jacket design, extended cylinder skirts, priority main oiling, and a 6-bolt main design for superior durability under high-performance conditions. The engine is equipped with BluePrint LS3 aluminum cylinder heads, a hydraulic roller camshaft, forged rotating assembly, and an internally balanced crankshaft combination engineered for high horsepower applications.

The PSLS42730CT is supplied as a Base Dressed package and does not include an ECU or wiring harness, allowing builders to choose their preferred engine management system. Included components such as the harmonic balancer, valve covers, LS swap oil pan, and timing cover make this engine an excellent foundation for custom LS-powered builds.

With a 4.125-inch stroke, forged crankshaft, forged pistons, and 11:1 compression ratio, the BluePrint 427 Pro Series delivers big-block levels of performance in a compact LS package.

Key Features:

• Part Number: PSLS42730CT
• GM LS Compatible Pro Series Engine
• 427 Cubic Inch Displacement
• 605 Horsepower
• 565 lb-ft Torque
• Base Dressed Configuration
• No ECU / Wiring Harness Included
• High Strength LSX-Style Cast Iron Block
• 6-Bolt Main Design
• Priority Main Oiling System
• Increased Deck Thickness
• Reinforced Main Webbing
• Extended Cylinder Skirt Design
• Improved Water Jacket Design
• 1-Piece Rear Main Seal
• OEM LS3 Front & Rear Cover Compatible
• BluePrint LS3 Aluminum Cylinder Heads
• Hydraulic Roller Camshaft
• Forged Pistons
• Forged Steel Crankshaft
• Forged 6.125" Connecting Rods
• Internally Balanced Rotating Assembly
• 11.0:1 Compression Ratio
• 91+ Octane Fuel Recommended
• Includes Harmonic Balancer
• Includes Valve Covers
• Includes LS Swap Oil Pan
• Includes Timing Cover
• Designed for Custom LS Swap Applications

Engine Specifications:

General:

• Manufacturer: BluePrint Engines
• Part Number: PSLS42730CT
• Engine Family: GM LS Compatible
• Series: Pro Series
• Configuration: Base Dressed
• Displacement: 427 C.I.
• Horsepower: 605 HP
• Torque: 565 lb-ft
• Compression Ratio: 11.0:1
• Fuel Recommendation: 91+ Octane
• ECU/Harness: Not Included

Block Specifications:

• BluePrint High Strength Cast Iron LSX-Style Block
• Bore: 4.0665"
• Main Cap Design: 6-Bolt Main
• Priority Main Oiling System
• Increased Deck Thickness
• Strengthened Main Webbing
• Improved Water Jacket Design
• Extended Cylinder Skirt
• 1-Piece Rear Main Seal
• OEM LS3 Front & Rear Cover Compatible

Rotating Assembly:

• Forged Steel Crankshaft
• Stroke: 4.125"
• Forged Connecting Rods
• Rod Length: 6.125"
• Forged Pistons
• Dish Pistons
• 22cc Piston Dish
• Internally Balanced Front & Rear Assembly

Cylinder Heads:

• BluePrint LS3 Aluminum Cylinder Heads
• Part Number: PS8015
• Chamber Size: 69cc
• Intake Valve: 2.165"
• Exhaust Valve: 1.590"
• Intake Runner: 259cc
• Exhaust Runner: 102cc

Camshaft Specifications:

• Hydraulic Roller Camshaft
• Three-Bolt Cam Design
• Intake Lift: .624"
• Exhaust Lift: .624"
• Duration @ .050:
  • Intake: 239°
  • Exhaust: 255°
• Lobe Separation Angle: 114°

Included Components:

• LS3 Aluminum Cylinder Heads
• Harmonic Balancer
• Valve Covers
• LS Swap Oil Pan
• Timing Cover

Does not include:

• Fuel Injection ECU
• Wiring Harness
• Intake Manifold
• Flexplate/Flywheel

Fitment Applications:

Compatible with custom GM LS-powered builds including:

• Chevrolet Camaro
• Chevrolet Corvette
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet Impala
• Chevrolet Silverado
• Chevrolet C10
• Pontiac GTO
• Pontiac Firebird
• Pontiac G8
• Chevrolet SS
• Street Rods
• Restomod Builds
• Pro Touring Vehicles
• LS Swap Applications
• Custom Muscle Cars
• Performance Vehicles

Verify transmission compatibility, ECU requirements, accessory clearance, fuel system requirements, and exhaust compatibility before installation.

Installation Notes:

• This engine does not include ECU or wiring harness.
• Requires customer-supplied engine management system.
• Requires a non-weighted flexplate or flywheel.
• Recommended fuel: 91+ octane.
• BluePrint recommends a 2200+ RPM stall converter for automatic transmission applications.
• Retrofit oil pan fits many 1955-1995 GM front-engine rear-wheel-drive vehicles.
• Not intended for pollution-controlled vehicles.
• Not compatible with dry sump applications.
• Professional installation and tuning recommended.