A good friend of mine just bought a boat with an 0-300 continental (a little 6 cyl) does anyone know what length/pitch stick prop he should be turning.
It says that the 0300 makes 145 hp@2700 rpm. I'm not sure about 4 cyl. Lycomings but I think there are some that are similar in power to this. Maybe someone can take this info and help you better.