Hawks Motorsports proudly offers the BluePrint Motorsports BPMS4271LS GM LS Compatible 427 C.I. Pro Series Power Adder Long Block, a race-inspired LS engine package engineered for enthusiasts demanding serious horsepower capability under boost. Designed specifically for turbocharger, supercharger, and nitrous applications, this 427 cubic inch LS-compatible long block delivers an impressive 610 horsepower and 510 lb-ft of torque naturally aspirated while providing the strength and durability required for extreme power-adders.

The BPMS4271LS is built around a BluePrint high-strength LSX-style cast iron block featuring increased deck thickness, reinforced main webbing, priority main oiling, billet main caps, and a 6-bolt studded main design for improved rigidity under high cylinder pressure. Internally, the engine is equipped with a forged 8-counterweight crankshaft, forged H-beam connecting rods, and Mahle 2618 custom forged pistons, making it an ideal foundation for high-boost LS builds.

Topped with BluePrint LSX-style 6-bolt studded aluminum cylinder heads and a performance hydraulic roller camshaft, this Power Adder long block provides excellent airflow and durability for demanding racing applications. The 9.5:1 compression ratio is optimized for forced induction combinations, allowing builders to safely increase power with turbochargers, superchargers, or nitrous systems.

The BPMS4271LS is supplied as a Long Block assembly and does not include ECU, wiring harness, intake manifold, or fuel system components, allowing builders to customize their engine management and induction setup to match their performance goals.

Key Features:

• Part Number: BPMS4271LS
• Manufacturer: BluePrint Motorsports
• GM LS Compatible Pro Series Engine
• 427 Cubic Inch Displacement
• 610 Horsepower
• 510 lb-ft Torque
• Power Adder Configuration
• Long Block Assembly
• Designed for Turbocharger, Supercharger & Nitrous Applications
• LSX-Style High Strength Cast Iron Block
• 6-Bolt Studded Main Caps
• Billet Main Caps
• LSX-Style Aluminum Cylinder Heads
• Mahle 2618 Custom Forged Pistons
• Forged H-Beam Connecting Rods
• Forged 8-Counterweight Crankshaft
• Hydraulic Roller Camshaft
• 9.5:1 Compression Ratio
• Internally Balanced Rotating Assembly
• LS Swap Oil Pan Included
• Valve Covers Included
• Timing Cover Included
• Harmonic Balancer Included
• No ECU / Wiring Harness Included

Engine Specifications:

General:

• Manufacturer: BluePrint Motorsports
• Part Number: BPMS4271LS
• Engine Family: GM LS Compatible
• Series: Pro Series
• Configuration: Power Adder Long Block
• Displacement: 427 C.I.
• Horsepower: 610 HP
• Torque: 510 lb-ft
• Compression Ratio: 9.5:1
• Fuel System: Not Included
• ECU/Harness: Not Included
• Fuel Recommendation: 100+ Octane Race Fuel

Block Specifications:

• BluePrint High Strength Cast Iron LSX-Style Block
• Bore: 4.0695"
• Stroke: 4.125"
• 6-Bolt Studded Main Design
• Billet Main Caps
• Priority Main Oiling System
• Increased Deck Thickness
• Reinforced Main Webbing
• Extended Cylinder Skirt
• Improved Water Jacket Design
• OEM LS3 Front & Rear Cover Compatible
• 1-Piece Rear Main Seal

Rotating Assembly:

• Forged 8-Counterweight Crankshaft
• Stroke: 4.125"
• Forged H-Beam Connecting Rods
• Rod Length: 6.125"
• Mahle 2618 Custom Forged Pistons
• Internally Balanced Front & Rear
• High Strength Rotating Assembly Designed for Boost

Cylinder Heads:

• BluePrint LSX Style 6-Bolt Studded Aluminum Heads
• BluePrint PS8020 Cylinder Heads
• Chamber Size: 70cc
• Intake Valve: 2.165"
• Exhaust Valve: 1.600"
• Designed for High Cylinder Pressure Applications

Camshaft Specifications:

• Hydraulic Roller Camshaft
• Three-Bolt Cam Design
• Intake Lift: .641"
• Exhaust Lift: .641"
• Duration @ .050:
  • Intake: 236°
  • Exhaust: 256°
• Lobe Separation Angle: 115.5°

Power Adder Capability:

Designed for:

• Turbocharged Applications
• Supercharged Applications
• Nitrous Applications
• Drag Racing
• Road Racing
• Drift Builds
• High Performance Street Applications

Features:

• Lower compression ratio for boost compatibility
• Forged rotating assembly
• Reinforced LSX-style block
• Six-bolt main strength
• High-flow aluminum cylinder heads

Included Components:

Includes:

• Complete Long Block Assembly
• LSX-Style Cast Iron Block
• LSX Style Aluminum Cylinder Heads
• Forged Crankshaft
• Forged H-Beam Rods
• Mahle Forged Pistons
• Hydraulic Roller Camshaft
• Harmonic Balancer
• LS Swap Oil Pan
• Valve Covers
• Timing Cover

Does Not Include:

• ECU
• Wiring Harness
• Intake Manifold
• Throttle Body
• Fuel Injectors
• Fuel Rails
• Starter
• Alternator
• Accessory Drive

Fitment Applications:

Compatible with custom LS-powered performance builds including:

• Chevrolet Camaro
• Chevrolet Corvette
• Chevrolet Chevelle
• Chevrolet Nova
• Chevrolet C10
• Chevrolet Silverado
• Pontiac Firebird
• Pontiac GTO
• Pontiac G8
• Chevrolet SS
• Drag Racing Applications
• Turbo LS Builds
• Supercharged LS Builds
• Nitrous LS Builds
• Restomod Vehicles
• Pro Touring Builds
• Custom LS Swap Applications

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

Installation Notes:

• Designed primarily for high-performance and race applications.
• Requires aftermarket ECU and wiring harness.
• Requires compatible intake manifold and fuel system.
• Requires forced induction system or custom high-performance application setup.
• Requires non-weighted flexplate/flywheel.
• Race fuel recommended due to performance configuration.
• Professional installation and tuning strongly recommended.
• Customer must verify all drivetrain components are rated for intended power output.