VALVE EXHAUST CRF250 04-07, PROX 28.1334-1 14721-KRN-670Hi Performance Racing Valve Exhaust STAINLESS STEEL. Size. Head Diameter 26mm, Stem Diameter 5. 00, Length 82. 10mm, Prox offers steel and titanium engine valves as well as titanium into steel conversion kits. The ProX titanium valves are manufactured to high quality standards. high tech Ti3al alloy is forged in one piece for extra strength while the material offers superior material properties at high temperatures the additional CrN coating offers

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