Pros and Cons of grinding/polishing combustion chambers smooth?

Bad Sport said
That's pretty wild.

I'd hate to have to do that manually on iron heads! Mostly done via cnc on aluminum heads... some guys claim 15-40 hp on a race engine.

I guess I would believe that a rough texture would keep the fuel mixed with the incoming air... I might rough up the intake side of my W2's before the next racing season.