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[DAVETOM]

Hi,
I`ve recently bought a C15 head ( part no. 40-338) that according to the Rupert Ratio book is ` scrambles `59 `60 and big valve with 15/16 choke. The exhaust is standard C15 but the inlet measures 1" 7/16 ( no valves with head). I`ve read that SS80 is 1" 13/32, but does anyone know if mine is standard?. The inlet is ported but don`t know whether that is original or later. I need a new inlet valve and not sure where to get one? Thanks in advance, Dave