Scat 9000 Series Big Block Chevy 496-540 CID Stroker cast steel crankshaft, internal balanced may require mallory, 4.250″ stroke. Light weight at 64-65 lbs. Rod journal diameter 2.200″ mains 2.749″ diameter . 2-PC rear main seal, must use 6.385″ rod length, needs balanced before put in to service. Special order 3-5 business days. Please e-mail with questions.