We call this one the stroker which comes from it's huge 70mm crank turning your 600 into a torque monster. The kit comes with a set of fully ported cast cylinders, head set with domes and exhaust valves. Case porting is included as well as new piston kits, all necessary gaskets and your new stroker crank. Even better, it will run on premium pump gas with our single pipe. Also required (not included) are V-Force III reeds, carb boring and Carl's single pipe.