The codes appear to be Columbo and Bariani. It is certainly their style of number.
16- number of valves.
280- off the seat duration (not opening duration).
I cannot access the C&B site.
Why do people making websites always feel the need to meddle and necessitate a newer browser and use more data for getting information? 'Progress' is an illogical concept.
Anyway, they aren't numbers for Kent Cams, Cat Cams, Piper Cams or Alquati (Pittatore camshafts).
Have I missed any?- maybe Shankle?
I'd contact C&B but sometimes companies aren't keen on helping as they are not making a sale on new parts.