Scat small block chevy 305-350-383 4340 forged steel internal balanced 3.750″ stroker crankshaft. Superlight at 44-45 lbs pendulum undercut counter weights, lightening holes in rod journals, aero wing counter weights, star flange. Minimum rod length 5.700″. Rod journal 2.100″ mains 2.449″ diameter. Precision ground, heat treated & 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.