Description Magnus 4G63 Crank Drive Pulley This crank drive pulley fits within the stock damper or a fluid damper on your engine. Can be used to drive any type of pump you wish, fits standard 1″ mandrel with 1″ belt Can be used to drive the your dry sump or fuel pump from the crank pulley, features a 1″ shaft with .125″ key way Features Billet aluminum construction 1/8th inch key way with 1 inch mandrel to attach HTD or Gilmer drive gear Can be used to drive dry sump pumps, Fuel pumps, power steering, or anything else you can think of. Precision ground centering washer Applications All 4G63 Fits within the stock pulley or Fluid damper Part # MMCENG2020  Magnus 4G63 Crank drive (for stock application) MMCENG2023  Magnus 4G63 BBC ATI crank drive all new ONE PIECE lightweight 19 tooth HTD