SBC 4340 Forged Crank 3.480 Stroke/350 mains

The Manley SBC 4340 Forged Crank with 3.480 stroke and 350 mains represents purpose-built crankshaft engineering for small-block Chevrolet performance applications. This forged steel component is designed for high-RPM durability and precision balance, serving as the rotating foundation for serious engine builds where reliability at elevated power levels is non-negotiable. The 3.480-inch stroke dimension sets displacement and peak power characteristics for the small-block platform, while the 350 mains designation confirms compatibility with standard small-block journal sizing.

Constructed from 4340 alloy steel and forged for structural integrity, this crankshaft delivers the fatigue resistance required in competition, street-performance, and race engine environments. The internal balance configuration simplifies the build process by eliminating external balance requirements, reducing complexity in rotating-assembly assembly and allowing straightforward installation into existing engine blocks. The two-piece seal design accommodates modern oil-retention standards while maintaining compatibility with conventional small-block architecture. At 56 pounds, the crankshaft weight aligns with typical specifications for this stroke and material combination.

This crankshaft serves engine builders and enthusiasts developing small-block Chevrolet platforms across road racing, bracket racing, street performance, and hot rod applications. Builders selecting a 3.480 stroke typically aim for a specific displacement target or RPM operating window within the small-block platform. The forged construction and precise manufacturing tolerances inherent to Manley products support consistent performance across multiple engine cycles, critical for turbocharged applications, nitrous builds, and sustained high-load operation where inferior crankshaft materials fail prematurely.

Manley crankshafts are recognized within the performance engine community for dimensional accuracy and material consistency. Selecting a forged small-block Chevrolet crankshaft from an established performance manufacturer ensures the rotating assembly foundation meets the demands of modern fuel systems, electronic ignition, and variable-load driving conditions. The Manley SBC 4340 Forged Crank fits the category of hard-part components where material selection and manufacturing precision directly correlate to engine longevity and reliability.