Note: Only 1x Cylinder Head, Rings. Gasket, don't have Piston Application : for Honda S65 for Honda TRX70 for Honda ATC70 1978-1985 for Honda C70 1980-1983 for Honda C70 1971-1972 for Honda CRF70F 2004-2009 for Honda CRF70F 2011-2012 for Honda CT70 1969-1994 for Honda XR70R 1997-2003 Engine: ATC70 CT70 TRX70 CRF70 XR70 70CC 72CM3 Specification: Condition: 100% New, and never been used. Warranty: 2 years Quantity: as the pictures show Size: Outer Bore Size: 47mm Inner Bore Size: 39mm Intake Valve Outside Diameter: 23mm / Length 66mm Exhaust Valve Outside Diameter: 20mm / Length 66mm Note: This head can be used on either a 50cc or 70cc engine. But Please note that it is for Domed 50cc or Flat Top 70cc. If you have a 50cc engine: There are 2 different 50cc Cylinder heads for Honda. Compare the Combustion Chamber Size shown below, to your current head. This head will only work with DOMED pistons. If you have a 70cc engine: There are 2 different 50cc Cylinder heads for Honda. Compare the