Hawks Motorsports proudly offers the BluePrint Engines PSLS42730CTF GM LS Compatible 427 C.I. Pro Series Engine, a high-performance LS crate engine package designed for enthusiasts looking for big cubic inch LS power with a flexible, builder-friendly configuration. Producing approximately 605 horsepower and 565 lb-ft of torque, this Base Dressed Pro Series engine combines modern LS architecture with premium performance components for street, swap, and custom applications.

The PSLS42730CTF features a BluePrint high-strength LSX-style cast iron block, LS3 aluminum cylinder heads, forged rotating assembly, and a hydraulic roller camshaft designed to deliver excellent airflow, durability, and horsepower potential. The increased displacement of the 427 C.I. platform provides strong low-end torque while maintaining the compact packaging advantages of the LS engine family.

This version includes a GM plastic intake manifold and is supplied as a Base Dressed assembly without ECU or wiring harness, allowing builders to select their preferred engine management system and tuning solution. The included LS components make this engine an excellent foundation for Camaro, Corvette, Chevelle, C10, restomod, and custom LS swap projects.

Key Features:

• Part Number: PSLS42730CTF
• Manufacturer: BluePrint Engines
• GM LS Compatible Pro Series Engine
• 427 Cubic Inch Displacement
• 605 Horsepower
• 565 lb-ft Torque
• Base Dressed Configuration
• GM Plastic Intake Manifold Included
• No ECU / Wiring Harness Included
• BluePrint High Strength LSX-Style Cast Iron Block
• LS3 Aluminum Cylinder Heads
• Forged Steel Crankshaft
• Forged Connecting Rods
• Forged Performance Pistons
• Hydraulic Roller Camshaft
• Internally Balanced Rotating Assembly
• 11.0:1 Compression Ratio
• 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: PSLS42730CTF
• 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 System: EFI Ready
• Intake Manifold: GM Plastic Intake Included
• ECU/Harness: Not Included
• Fuel Recommendation: 91+ Octane

Block Specifications:

• BluePrint High Strength LSX-Style Cast Iron Block
• Bore: 4.125"
• Stroke: 4.000"
• 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
• LS3 Front & Rear Cover Compatible

Rotating Assembly:

• Forged Steel Crankshaft
• Stroke: 4.000"
• Forged Connecting Rods
• Rod Length: 6.125"
• Forged Performance Pistons
• Internally Balanced 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
• Intake Lift: .624"
• Exhaust Lift: .624"
• Duration @ .050:
  • Intake: 239°
  • Exhaust: 255°
• Lobe Separation Angle: 114°

Intake System:

GM Plastic Intake Manifold Included

Features:

• OEM-style GM LS plastic intake design
• Lightweight construction
• Compatible with LS throttle body systems
• Provides excellent street drivability
• Allows builder-selected ECU and tuning solution

Included Components:

Includes:

• LS3 Aluminum Cylinder Heads
• GM Plastic Intake Manifold
• Fuel Rails
• Fuel Injectors
• Valve Covers
• Harmonic Balancer
• Timing Cover
• LS Swap Oil Pan
• Oil Pump
• Pickup Tube

Does not include:

• ECU
• Wiring Harness
• Engine Management System
• Exhaust Components
• Starter
• Alternator

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
• LS Swap Applications
• Custom Muscle Cars

Verify transmission compatibility, accessory clearance, fuel system requirements, ECU compatibility, 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.
• Professional tuning recommended.
• Recommended fuel: 91+ octane.
• Verify accessory drive and exhaust clearance for vehicle application.
• Not intended as a direct factory replacement engine.