Several of the builds I was the happiest with got the sand rolled finish.
It worked before, I figure it’ll work again.
The highest HP motors I’ve done had cnc’d ports with the ridges left in them.
Overall, I think it’s fairly obvious that the port design and flow will ultimately have much more of an impact on the power than whether or not the port walls are smooth or rough.
At one point during a discussion on this subject over on YB, Chris Uratchko said his best build had smooth ports.
That guy does some damn impressive builds.
