Kit comes with everything to big bore and stroke your current motor to a 662  Crank, Rod, Piston, Bearings, Seals, Gaskets, Head studs.  You will also need a Raze 662 Ecu kit.  If using a 12-15 450 as your base you will need to purchase a ktm 500 timing chain and guides as well. This motor makes 84 HP on pump fuel.  We are a full engine performance shop.  Ship us your motor in a cooler and we will build your engine with a warranty with a 2 week turn around time.  Ask about our 6th gear transmission upgrade, as well as rim finished transmissions, and performance cams.