Buick V6 4140 Crankshaft 3.625 Stroke

The Buick V6 4140 Crankshaft with 3.625 stroke is a precision-engineered rotating assembly component designed for engine rebuilds, performance upgrades, and complete engine restorations on classic and vintage Buick V6 platforms. This forged crankshaft serves as the foundation of your engine's bottom end, converting reciprocating piston motion into rotational power that drives your vehicle down the road. Whether you're rebuilding a stock engine or planning a serious performance modification, a quality crankshaft is non-negotiable for reliability and longevity.

The 3.625-inch stroke dimension determines the piston travel distance within the cylinder bore—a critical specification that directly affects displacement, power band characteristics, and engine revving capability. Eagle's 4140 steel construction provides excellent fatigue resistance and durability under sustained load cycles, making it ideal for both daily-driver reliability and occasional high-rpm operation. The forged manufacturing process ensures minimal internal stress concentrations and superior strength-to-weight ratio compared to cast alternatives. At 48 pounds, this crankshaft is appropriately weighted for V6 applications, balancing inertial properties needed for smooth operation across the RPM range.

This crankshaft is essential for anyone undertaking a Buick V6 engine rebuild—whether restoring a classic muscle car, refreshing tired original equipment, or supporting a mild to moderate performance build. Proper installation requires professional machine shop balancing to match your specific pistons, rods, and harmonic balancer for vibration-free operation. Mechanics and enthusiasts value Eagle components for consistent quality and competitive pricing on OEM-replacement and performance-oriented crankshafts. Verify your exact engine code and displacement before ordering to ensure perfect fitment with your particular Buick V6 configuration.