This modded 360 sounds quite healthy, i hope my 600 will one day soon too.
and one know where the dohc heads come from? im thinking they are suzuki.
heres all the twin cam 600 engines i can find, ive done hrs of research and cant find any leads, the best i found was a collection of kei car racer pictures that had these heads but all the japanese scripture was useless to me as i cant read it. I beleive its a kawasaki Ninja head, but which one?