Hawks Motorsports proudly offers the BluePrint Engines PSLS42780CTF GM LS Compatible 427 C.I. Pro Series Engine, a high-performance LS-based crate engine designed for enthusiasts seeking big cubic inch LS power with the flexibility of a custom engine management setup. Producing 585 horsepower and 545 lb-ft of torque, this Base Dressed Pro Series engine delivers impressive street and track performance for LS swaps, restomods, muscle cars, and custom performance builds.

Built around a BluePrint high-strength LS-compatible block, this 427 cubic inch engine combines increased displacement with premium internal components for dependable horsepower and durability. The engine features LS3-style aluminum cylinder heads, hydraulic roller camshaft, forged rotating assembly, and a reinforced LS architecture designed to handle demanding performance applications.

The PSLS42780CTF comes without an ECU or wiring harness, giving builders complete control over their preferred engine management system, tuning platform, and vehicle integration. This makes it an excellent choice for custom LS swap projects where a standalone EFI system or aftermarket ECU is preferred.

With a large-displacement 427 C.I. foundation, aggressive Pro Series components, and LS compatibility, the BluePrint PSLS42780CTF provides the perfect combination of modern LS technology and traditional big-inch performance.

Key Features:

• Part Number: PSLS42780CTF
• Manufacturer: BluePrint Engines
• GM LS Compatible Pro Series Engine
• 427 Cubic Inch Displacement
• 585 Horsepower
• 545 lb-ft Torque
• Base Dressed Configuration
• No ECU / Wiring Harness Included
• LS-Compatible High Strength Cast Iron Block
• LS3 Aluminum Cylinder Heads
• Hydraulic Roller Camshaft
• Forged Rotating Assembly
• Forged Steel Crankshaft
• Forged Connecting Rods
• Hypereutectic Pistons
• Internally Balanced Assembly
• 10.7:1 Compression Ratio
• 91+ Octane Fuel Recommended
• LS3-Style Intake Compatibility
• LS Swap Oil Pan Included
• Harmonic Balancer Included
• Valve Covers Included
• Timing Cover Included
• Designed for Custom LS Swap Applications

Engine Specifications:

General:

• Manufacturer: BluePrint Engines
• Part Number: PSLS42780CTF
• Engine Family: GM LS Compatible
• Series: Pro Series
• Configuration: Base Dressed
• Displacement: 427 C.I.
• Horsepower: 585 HP
• Torque: 545 lb-ft
• Compression Ratio: 10.7:1
• Fuel System: EFI Ready
• ECU/Harness: Not Included
• Fuel Recommendation: 91+ Octane

Block Specifications:

• BluePrint High Strength LS-Compatible Cast Iron Block
• Bore: 4.125"
• Main Cap Design: 6-Bolt Main
• Priority Main Oiling System
• Reinforced Main Webbing
• Increased Deck Strength
• Extended Cylinder Skirt Design
• Improved Water Jacket Design
• 1-Piece Rear Main Seal
• LS3 Front & Rear Cover Compatible

Rotating Assembly:

• Forged Steel Crankshaft
• Stroke: 4.000"
• Forged Connecting Rods
• Rod Length: 6.125"
• Hypereutectic Pistons
• Internally Balanced Rotating Assembly
• High Strength Rod Bolts

Cylinder Heads:

• BluePrint LS3 Aluminum Cylinder Heads
• 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
• High Performance Street Profile
• Designed for Strong Midrange Torque and Top-End Power

Included Components:

• LS3 Aluminum Cylinder Heads
• Valve Covers
• Harmonic Balancer
• Timing Cover
• LS Swap Oil Pan
• Oil Pump
• Pickup Tube
• Basic Engine Accessories

Does not include:

• ECU
• Wiring Harness
• Intake Manifold
• Throttle Body
• Fuel System Components

Fitment Applications:

Compatible with custom GM LS-powered builds including:

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

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

Installation Notes:

• Requires customer-supplied ECU and wiring harness.
• Designed for custom LS swap applications.
• Requires compatible LS transmission setup.
• Verify flexplate/flywheel compatibility before installation.
• Requires compatible fuel system and tuning solution.
• Professional installation and tuning recommended.
• Recommended fuel: 91+ octane.
• Check oil pan, accessory drive, and exhaust clearance for specific vehicle applications.