I have what is clearly a bitsa engine, it has K cases with the narrow / hollow gearbox output shaft, but has a 410 head.
The head is not black and shows no sign of ever being black, did Honda use the 410 casting in silver on any other model?
I'm planning to build the whole lot into some K7 cases, because I have a mint set and want a silver engine, any gotchas fitting the 410 head / barrels onto K7 cases?