New Eagle small block chevy 383 cast steel internal balanced 3.750″ Stroker crankshaft. Minimum rod length 5.700″. Rod journal 2.100″ mains 2.449″ diameter, typical weight 49lbs. This is a two piece rear main seal and must be balanced before put in to service. New old stock open box item and does not have factory box. Please e-mail with questions.