so I bought a piston but I cant tell what head its for. Its a takegawa. Same height and width as my TB 52mm. But When i comare the tops(both flat tops) the TB has deeper notches for the valves where as the Takegawa has the slightest groove for the valves. So does anyone know what head this piston is for? no there are no part numbers anywhere i can see on it. Thanks guys so much.