Send us your cylinders and head to get this great big bore kit to wake up that 500! First we bore your stock cylinders then extensively port them to our special spec then send them to get plated. Next we machine your head for the bigger bore and to give you more power! Available in high or low compression. Next we add in a set of our extremely high quality forged pistons, a gasket set, and timing key to finish up this kit. Power Commander required. 116 Horsepower! Extremely flat torque curve that makes tuning this package a snap.