Read the article below and that is the reason why I will a rough surface , my ports are a little bit sandblasted :
Polishing is, if possible, a myth within a myth. It is one of those traditional yet ineffective techniques which has somehow survived in the dank swamp of motorcycle mythology. However, the industry is more to blame than the unwitting public. The truth is, port polishing in a practical sense serves merely to "sell" expensive porting jobs. It's "eye candy." The customer has been conditioned to be more easily impressed by the unreality of what he sees than the reality of what he can't see. Sort of like the detail work done on your car during its 10,000 mile inspection. As just explained, most of the magic in port work is almost invisible -- fully 90% of effective porting takes place within an inch of the valve seat. The parts of the port that are usually polished are far from this area. The polish gives the customer something to look at.
Furthermore, polish is not only unnecessary, it's actually harmful, in two ways. The first concerns the airflow itself. The experience of countless engine builders, plus research by Superflow, Boeing, and various members of the Society of Automotive Engineers, indicate that a smooth surface is not necessarily the slipperiest where air is concerned. Ever notice that an airplane's wings are not shiny smooth, but rough? The rough surface reduces air drag, and the wing glides through the air easier. Olympic bobsled teams stick sandpaper-like skateboard grip tape to the sides of the sled and the tops of their helmets for the same reason. Air tends to get lazy on a smooth surface. It's called the "boundary layer effect," and it refers to the fact that an ultra-smooth surface accumulates air pressure next to it. This pressure is really stagnant air, and it effectively obstructs airflow. A slightly roughened surface eliminates this boundary layer and increases airflow. The second way polish is bad concerns combustion. Intake tracts don't just flow air, remember. They flow an air/fuel mixture, whose behaviour is quite different from plain air. The same lazy air boundaries that constrict a polished port's airflow also make fuel "drop out" of suspension in that air. The mixture then enters the cylinder less thoroughly mixed, and poor combustion and reduced power result. For this reason, most builders glass-bead the port walls instead of polishing them. The slight roughness creates tiny eddy currects which keep fuel droplets suspended in the port airstream. Good combustion is thus ensured.
