Overview 

The LS 4.000" forged steel crankshaft is a high-strength, performance-oriented component designed to increase displacement and torque in LS engine builds. Manufactured from durable forged 4340 steel, it offers excellent resistance to wear and fatigue under demanding conditions. The crankshaft features internal balancing to reduce engine vibrations and improve longevity. Large-radius fillets at stress concentration points enhance structural integrity, while precision CNC machining ensures accurate journal sizing and tight tolerances for seamless compatibility with OEM and aftermarket rods and bearings. Micropolished journals minimize friction and promote efficient lubrication. Additionally, the crankshaft undergoes multi-stage heat treatments, including nitriding, shot peening, and stress relief, to boost surface hardness and durability. Overall, it delivers reliable performance and durability for high-RPM and high-power LS applications.

Features 

• 4.000" stroke for increased displacement and torque in LS engine builds

• Forged 4340 steel construction for superior strength and durability

• Internally balanced to reduce vibrations and improve engine smoothness

• Large-radius fillets at critical stress points to enhance crankshaft strength

• Precision CNC machining for accurate journal sizing and tight tolerances

• Micropolished journals to minimize friction and promote better lubrication

• Multi-stage heat treatments including nitriding, shot peening, and stress relief for improved surface hardness and fatigue resistance

• Compatible with OEM and aftermarket rods and bearings for easy installation