Forged 4340 steel crankshaft used to create 383-cubic-inch engines with 3.800" stroke. Rod journals are 2.10". Mains are standard 350 size. NOTE: Should be used with connecting rods P/N 19169670,bearing kit P/N 17800761, standard pistons P/N 88962748 or 0.030" oversize pistons P/N 88962749, balancer P/N 12498008, and 1986-and-later one-piece crank seal design flywheel or flexplate."