12489436 Crankshaft, 383Ci, 4340 Steel


This small-block crankshaft is used in our 383 ci crate engines. The crankshaft forging is made of 4340 steel and has a 3.800" stroke. 
Use with the following components only: Single connecting rod - P/N 12497624 Set of 8 rods - P/N 12497870 Piston, standard - P/N 12489437 Piston .030 oversize - P/N 12497879 Balancer - P/N 12498008 Flywheel or flexplate - Use 1986 or later one piece crank seal design