Our new spline drive is available for engines running the popular ATI dampener with MSD crank trigger combo. Made from billet aluminum and then anodized for durability, these drives feature the next evolution in drive design. Featuring a large nut to aid in turning the motor over, this design gets rid of the key and mandrel and features a modular spline design. Includes adapter and bolt for crank, spline drive hub and hardware, and endcap and bolt for drive. Pulleys and belt sold seperately.