Inlet valve top quality made in UK Plasma hardened to fit the A10 650cc alloy head only and Later model Rocket Gold Star , valve is 1.500 inch diameter (38.1mm) BSA Part number 67.0961
Valve is hardened using the "Pulsed Plasma Nitriding." process, this gives the valve resistance to wear and anti friction properties , when this type of valve is matched with our Colsibro material valve guides , you have the best combination for valve and guide, for performance and longevity
