Topic: Identifying K vs F1 vs F2 engine Components

[jaytee-nz]

So I recently bought a garage full of parts that has a mixture (I think) of K, F1 (NZ did not get the F0 model) and F2 engine components.
How do I tell the difference between a K, F1 and F2 head ?
How do I tell the difference between the cylinder blocks of these models ?
What else is different engine wise ?
I also got a no number set of cases with these parts. Could these be replacement cases for any of these models, or did Honda only supply them for early K models ? 
Thanks for your help.

[Tracksnblades1]

F1 has # 392 F2 & F3 has # 410.

But, 77/78k , I think has 392 also.

392 has the small valves and 410 has large valves.

[Tracksnblades1]

This may answer some more of your questions.
The F has some different transmission ratios.

http://www.webring.org/l/rd?ring=thehondasohc4web;id=2;url=http%3A%2F%2Fwww%2Esatanicmechanic%2Eorg%2F

You'll have to click on engine modifications from K0-F3

[Don R]

 F2/3 were painted black at the factory, 392 head also came on 750A but that's trivia. I believe F2/3 had the motor vin pad turned 90*.  Some replacement cases were never stamped for the engine number. The output shaft bearing varied in width, that may be a way to tell one era K from another without numbers.

[Jerry Rxman Griffin aka MuthaF'er]

Pistons on a 75/76 F and 77/78 K (not sure about the A's) BOTH have 392 cast near the wrist pin. However the domes may differ even with the 392 casting. My original 75 F 392 pistons had a full dome and my 78 K 392 pistons had a partial dome.

[jaytee-nz]

Thanks guys - much appreciated.