The "mirror finish" thing is a myth that looks good on paper but yields very very little gain for the amount of labor involved.
GM found that they picked up NOTHING on the LS7 heads by polishing. They just left the CNC finish with the slight texture.
On the other hand it couldn't hurt if you are doing it yourself but I wouldn't pay to have it done.
Im no expert, this is just what I picked up from reading threads and talking to people.
I also read a deal about a slightly rough surface causing a "boundry effect" and actually flowing better than a smooth surface. That part is sorta fuzzy so some expert here can chime in. However, if you are making big time power then it might cause more of a gain.
__________________
"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones: https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS
|