SBC L/W 4340 Forged Crank - 3.875 Stroke

The SBC L/W 4340 Forged Crank with 3.875 stroke is purpose-built for small block Chevy engine builders seeking maximum reliability without excess rotating mass. This SCAT ENTERPRISES crankshaft addresses a critical need in high-revving performance builds: maintaining structural integrity under sustained RPM loads while reducing inertia that slows acceleration and strains supporting components. Whether you're assembling a street performance engine, bracket racing platform, or street/strip hybrid, a forged 4340 crank forms the foundation of consistent power delivery and longevity.

Constructed from 4340 alloy steel and precision forged rather than cast, this crankshaft resists fatigue cracking that plagues inferior materials under detonation, pre-ignition, and high-boost scenarios. The 3.875-inch stroke increases displacement and torque production compared to stock small block geometry, enabling greater low-end responsiveness and mid-range pull without requiring cubic-inch overbore. Internal balance design integrates counterweights within the crank itself, eliminating external balance requirements and simplifying installation into a wider range of block configurations. The two-piece rear seal arrangement ensures compatibility with modern gasket materials and reduces oil weepage common in older single-seal designs. At 53.1 pounds, this lightweight forging cuts rotating mass critical to throttle response and fuel efficiency in carbureted and fuel-injected applications alike.

This crankshaft serves small block Chevy enthusiasts running 350 cubic-inch platforms and similar displacement combinations with the 3.875-inch stroke dimension. Professional engine builders, weekend warriors upgrading tired stock cranks, and restoration shops installing modern internals in vintage blocks all benefit from the durability and performance gains SCAT's forged design delivers. Confirm rod journal diameters and bearing clearances match your connecting rod selection before installation; this crank is compatible with standard small block mains and requires proper balancing to your specific rotating assembly weight. Installation should follow manufacturer torque specifications and break-in procedures to ensure oil film establishment across all bearing surfaces.