BBC 4340 Forged CS Crank 4.250 Stroke

The Callies Compstar 4340 Forged Steel Crankshaft, MPN BBP-425-CS, is a center counterweighted crankshaft for Chevrolet Big Block 454 applications. It features a 4.250" stroke, 6.385" and up rod length, and a 2.200" rod journal diameter. Constructed from 4340 forged steel and nitrided for durability, this crankshaft is designed to improve balance and reduce bearing loads, making it suitable for demanding environments like dirt track racing. It is internally balanced, has a standard crankshaft snout size, and utilizes a 2-piece rear main seal. Rod journals are drilled, and counterweights are profiled for piston clearance. This crankshaft requires narrowed bearings and does not include rod bearings or lightening holes in the rod throws.