I have heard that the rougher port will help atomize fuel, but I have always felt like if the fuel isn't being atomized correctly from the carb/injectors, the rougher port has been the solution for this. But then again, just my thoughts, and I always like to learn more about engines.
This is a misconception. Everyone discussing this should take the time to view the webinar that yellow rose posted in another thread, if you have not already done so.
Morgan actually talked about this. If I understand correctly, the air makes a turn better than the heavier fuel. So even if the mixture was perfectly emulsified, the heavier fuel keeps going and partially separates from the lighter air that makes the turns through the intake ports. The rougher texture apparently helps to re-introduce the fuel into the airstream. There is more to it and I may have butchered the description, so give the webinar a view.
