NAMURA TOP END REPAIR KIT. Top end repair kits include: Pistons, rings, and top end gasket sets. Namura Pistons have molybdenium/teflon skirt coatings which minimizes resistance and wear and anodized domes which provide superior heat or resistance. Both of these features help to extend the life span of the pistons. Rings will fit OEM pistons. Namura Top End Gasket Sets are precision cut Klingersil coated steel head gaskets for better sealing and high-temp resistance.