THIS HEAD WILL COME WITH NEW VALVES FULLY INSTALLED WITH NEW GUIDES, SEALS, SPRINGS AND ALL KEEPERS. ALL YOUR OTHER STOCK 82/83 C70 PARTS WILL WORK ON THIS HEAD NOTE YOU MUST USE A STOCK CAM (OR STOCK GRIND CAM) AND PISTON FROM THE 82 OR 83 PASSPORT'S WITH THIS HEAD. THIS CAN ALSO WORK TO CONVERT A 1982 TO 1987 Z50R TO 47MM BORE WHEN USING A 82/83 TYPE PASSPORT PISTON 82/83/JO/PASS/HEAD @ CLICK ON PICTURE TO EXPAND @ CLICK ON PICTURE TO EXPAND @ CLICK ON PICTURE TO EXPAND @ CLICK ON PICTURE TO EXPAND @ CLICK ON PICTURE TO EXPAND @ NOW_PICK STANDARD_47MM OR_47.25MM XR70_CRF70 (CT70_C70_1982 &_NEWER) PISTON_KIT 1/22P (S1165/S1166) @ NEW Z50R_1982_TO_1987 C70_1982_TO_1983 "GB2" STOCK GRIND CAM (332X)