Scat LS engine 4340 forged steel internal balanced 4.000″ stroker crankshaft, flywheel 6 bolt, keyway cut for damper, 58 tooth reluctor wheel, Weight 50 lbs , gun drilled mains, lightening holes in rod journals. Rod length 6.125″. Rod journal 2.100″ mains 2.559″ diameter. Shot peened, heat treated, precision ground & ion nitrided. Must be balanced before put in to service. Special order 7-10 business days. Please e-mail with questions.