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CB750 F2 cylinder head differences

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Galea:
Are there any external differences between a CB750 F1 and F2 cylinder head, apart from the black paint and different carburettors, which make identification possible with the assembled engine still in the bike?  I am quite wary of the bad reputation of the F2 head regarding the accelerated exhaust valve guide wear.

Jerry Rxman Griffin:
Top fin, intake side, next to #3 - look for "410". That would indicate a F2/F3. If you see "392" then it's a F/F1 or K7/K8. Neither then it's a K0-K6 in all likelihood.

Rozabikes Tim:
Rumour has it the F2 head also has "Cadburys" marked on it too.

SteveD CB500K0:
That'll be "Kraft" then...

Seamus:
Are there any identifying marks on the barrels (block) as well? Just wondered as I have a set of barrels that I believe are from a later K bike (judging by the oil seal holes on top).

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