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Piki, the F3 I don't think you'd tell it apart from a F2 as they're essentially their same bike just moved the name along one notch, did the same with the K7 to K8 as well. Think USA only.Roy, I know it's recorded some places ( I've found it mentioned in contemporary road tests) that the F2 used different valve angle but I can't find anything official that says that, don't know if anything exists. I've seen the two head's apart but never next to each other to make a comparison directly. The F2 has bigger fins as far as I know but it just doesn't seem to me that the valve angle changed, after all its only 3mm on exhaust and 2mm on inlet. I'm not certain of it but certainly intrigued if they did change it. Also, more time ago than I want to remember, a friend ran what I thought was K2 cam gear on an F2 head to replace a damaged set, or at least that's how I recall it. I don't know how true that is but would obviously not be possible if the valve were moved. They also seem to be in the same place inside the tappet adjust caps with the rocker covers being the same part it seems.It don't know if anyone else on here has for example the rocker part numbers to compare perhaps.