Check the specs on Ian Rankin's website (link in my last post to you).
If it is a factory F cam it SHOULD have the letter F stamped into the rear
end. If it doesn't have a letter stamped into the rear end it may be hard
to tell what any other markings mean. I think they relate mostly to
foundry lots, etc.

If yours is a European-delivered Amazon, especially if it has only one
carburetor, the original cam was probably an A cam, designed to furnish
a lot of low-speed torque on medium or low-octane gasoline but not very
good high-rev performance
--
George Downs, Bartlesville, Oklahoma, Central US