Scat small block chevy 305-350-383 4340 forged steel internal balanced 3.875″ stroker crankshaft. Standard weight at 53 lbs, lightening holes in rod journals, Minimum rod length 6.000″. Rod journal 2.100″ mains 2.449″ diameter. Shot peened, heat treated, precision ground & nitrided. This is a two piece rear main seal and must be balanced before put in to service. Special order 7-10 business days. Please e-mail with questions.