SBC Cast Steel Crank 3.480 Stroke -1-Piece RM

The SBC Cast Steel Crank 3.480 Stroke -1-Piece RM by EAGLE represents a purpose-built rotating assembly component engineered for small-block Chevrolet (SBC) engine builders and high-performance automotive enthusiasts. This cast steel crankshaft delivers the robust durability required in both street and competition applications where reliability under load is non-negotiable. The 3.480-inch stroke specification makes this crank ideal for builders targeting mid-range displacement and torque characteristics typical of modified SBC platforms used in motorsports, hot rodding, and engine rebuilding.

The one-piece rear main seal (RM) design eliminates the complexity and potential leak points associated with two-piece configurations, providing superior oil containment and simplified installation. Cast steel construction balances affordability with adequate strength for naturally aspirated and moderately boosted applications, resisting the cyclic stresses of combustion and inertial forces across the entire RPM range. The 3.480-inch stroke geometry directly influences engine displacement when paired with the appropriate bore diameter, allowing builders to dial in precise cubic-inch targets and achieve desired power delivery characteristics without requiring expensive forged alternatives for standard performance builds.

Engine builders, machine shops, and performance enthusiasts benefit most from this component when assembling long-block or short-block assemblies for Chevrolet small-block platforms. The one-piece rear main configuration simplifies installation and reduces assembly time compared to traditional two-piece designs, making it particularly valuable in production-oriented rebuild scenarios. Verification of journal diameters, main cap bolt patterns, and oil clearance specifications during fitment ensures optimal performance; EAGLE cranks are precision-manufactured to OEM tolerances and work seamlessly with standard SBC blocks, connecting rods, and rotating assembly components across multiple generation small-block variants.