Kibblewhite Black Diamond Valve For Harley Twin Cam Features: One-piece stainless-steel, stellite-tipped valve is fortified by a special nitrided process with .002 depth and .0002 surface buildup to improve wear properties and reduce friction provides resistance to corrosion wears superior to hard chromium and electrolysis nickel-plating Lightweight with profiles that provide excellent flow characteristics Compatible with leaded and unleaded fuels and can be run in cast iron- and bronze-type guides at close tolerances for maximum oil control and heat dissipation Fits 88 / 96 / 103 engines Made in the USA Standard Specs: 1.805 Head Diameter - Intake replacement OEM 18074-05 1.575 Head Diameter - Exhaust replacement OEM 18085-05 Oversize Specs: 1.900 Head Diameter - Intake 1.630 Head Diameter - Exhaust