Attributes . pistons, piston rings, piston pins, gaskets, valves and valve springs. Pistons fully machined from 2618 aluminum alloy with a performance skirt coating. Black Diamond or White Diamond engine valves (depending on application). Lightweight racing valve springs kit with titanium valve spring retainers, dual springs and H.T. steel base washers (springs are suitable for use with high-performance cams). All necessary gaskets, seals and O-rings included. Sold as a complete kit. . Names