Kibblewhite Black Diamond Valve For Harley EVO Features: All Kibblewhite Precision Machining, Inc. stainless steel valves are impregnated by a special German process with a .002 deep & .0002 surface build-up to improve wear properties and reduce friction This process provides resistance to corrosion and wear superior to that developed by hard chromium and electroless nickel plating These stellate-tipped valves are light and the profiles provide excellent flow characteristics