Brodix C45443756385 forged crankshaft is manufactured using 4340 steel to provide durability and strength. Designed for Big Block Chevy engines with a 4.375 in. stroke and using a minimum length 6.385 in. connecting rod. These cranks have undergone a deep nitride, shot-peened, magnafluxed, micro-polishing, and stress relieving treatment for a top-quality product.