SBT sells the motor on a rebuildable core exchange basis. Visit Program Description for further details.This is a Standard remanufactured Polaris 650 engine. It includes the cases, cylinders, trued and welded crankshaft, head, all new internal parts & a woodruff key.Installation Gasket Kit required.Please call SBT for shipping rates At this time the item you are selecting is sold on a cores first basis, please refer to our Program Description on sending the correct components to SBT. The lead time average for turn around is approximately 5-10 business days. Once SBT receives the core, this core has entered the remanufacturing process and cannot be returned.