WISECO TOP END PISTON KIT. Wiseco’s complete top end piston kits are offered for nearly every popular application. These kits contain everything you need to complete your rebuild the right way. 4-stroke kits feature a ‘race-ready’ dome finish with smooth edges for improved combustion flow. Most PK/SK/WK/VT kits from Wiseco feature a complete top end gasket kit . 4-stroke race applications feature Wiseco’s ArmorGlide skirt coating to provide reduced friction and noise to contribute to increased horsepower. Dedicated forgings used for superior strength to weight ratio. High-Performance ring kit and alloy pin included with each piston kit.