Brian Crower Crankshaft -Subaru EJ257-STi 83mm Stroke 4340 Billet

The Brian Crower BC5629 is a high-performance 4340 billet steel crankshaft designed for Subaru EJ257 STi engines. It features an 83mm stroke, contributing to increased engine displacement. The crankshaft undergoes a meticulous manufacturing process including stress relief, shot peening, magnaflux inspection, and nitriding heat treatment for enhanced durability and performance. Its fully profiled counterweights are engineered to minimize oil windage within the crankcase, which reduces oil resistance and improves the engine's RPM potential. It also features large radius journals for rigidity in high horsepower and high RPM applications, and gun-drilled, CNC-ground oil holes for superior lubrication.