This is a 425 forged steel crank offset ground to 4.250 stroke and the rod journals are cut and widened for the big Chevy rods , 2.200 diameter , it is also Nitrided , it is new - never used since machining . Rods are STD mains are .030 . It comes with a ATI_ SFI flex plate for internal balance . Asking $1000 plus shipping or pick up at my location . zip 60034 , Hebron Illinois