Kibblewhite Black Diamond Intake Valve For Harley 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 Head Diameter: 1.935/49.15 mm Stem Diameter: 0.3090 Tulip: 23 Overall Length: 3.615 Remarks: Standard Replaces OEM 18070-70 Head Diameter: 2.000/50.80 mm Stem Diameter: 0.3090 Tulip: 23 Overall Length: 3.615 Remarks: Oversized