OK that is what I figured....I never really looked or noticed. RCR did my intake, so I assume he also smoothed them out too. I will try to remember to look next time I have it off.In the intake manifold runners the fuel injector bosses protrude into the airstream. I just smoothed them out with a dremel. Didn't go crazy, otherwise you go into the boss. Does it make a difference. Maybe. Probably not. Who knows. I noticed on professionally ported intake manifolds they were smoothed out so I copied their work. I am not sure I would do it again if it was worth the time/effort. I don't have equipment to measure any airflow gains.