THIS IS A NEW BARE HEAD WITH THE VALVES, GUIDES, SEALS, SPRINGS, SPRING KEEPERS AND VALVE COTTORS ALL NEW AND INSTALLED!! EVERYTHING ELSE WILL FIT FROM YOUR OLD HEAD,INCLUDING YOUR OLD CAM. THIS IS CLASSIFIED AS AN "OLD 70 HEAD" AND DOME. IT WILL REPLACE THE STOCK HEADS FROM 80 - 81 C70 PASSPORTS ALL CL/SL/XL70'S 69 - 81 CT70'S ALL ATC70'S ALL TRX70'S THE STOCK PISTONS FROM THE ABOVE MODELS WILL WORK WITH THIS HEAD.. IF YOU USE THE 85CC/51MM CYLINDER AND STOCK OR STROKER CRANK THEN YOU NEED OUR # (100041) PISTON.. OR IF YOU USE THE 88CC/52MM CYLINDER AND STOCK OR STROKER CRANK THEN YOU NEED OUR # (100042) PISTON.. BUT IF YOU WANT THE BIG 95CC/54MM CYLINDER AND STOCK OR STROKER CRANK THEN USE OUR # (54/GBO) PISTON!!!!!! 100002 @ PARTS THAT WORK IN THIS EMPTY HEAD