Top-end Kit includes: 2 SBT pistons 2 Rings 2 Wrist-Pins 2 Wrist-pin bearings 2 C-Clips 4 Washers 2 Base Gaskets 1 Head/Head Cover Gaskets/O-Rings Exhaust gasket(s). Additional purchase of Power valve rebuild kits (46-406) & lever links (46-406-14) are recommended.