Removing vicous fan

As I understand, the 6-vane pump was on AC cars and the 8 vane on non-AC cars. Confused a lot of people here since why wouldn't you want the best coolant flow on all cars (and especially w/ AC). We finally figured out the difference was because AC and non-AC cars had different diameter pulleys. Might even be true. Anyway, 8-vanes would seem better.