they probably put it in the middle for fitment reasons. lol
idk about equal flow as after seafoaming, id scope my valves sometimes and numbers 2 and 3 valves would be soaked, but numbers 1 and 4 would more often than not have nothing on them that looked even remotely helpful. idk though as I never pull the mani to do a full inspection until we just went and cleaned the valves by hand.






