Callies - SBC 4340 Forged Magnum Crank - 3.875 Stroke

The Callies SBC 4340 Forged Magnum Crankshaft with a 3.875-inch stroke is engineered for Small Block Chevy engines, offering exceptional durability and performance. Manufactured from ultra-pure AISI 4340 steel, this crankshaft undergoes multiple heat treatments, including the Ultra-Case nitride process, resulting in a deep case that enhances strength and provides an extremely hard load-bearing wear surface. The Ultra-Case process generates a hardened steel layer deep enough to maintain integrity even after a -.010 regrind. Key features include gun-drilled mains and fully profiled counterweights, contributing to reduced weight and improved balance. Designed for internal balance, this crankshaft is compatible with a 2-piece rear main seal and features a 2.000-inch rod journal diameter. Ideal for high-performance applications, the Callies Magnum Crankshaft delivers reliability and strength for demanding engine builds.