Rasp Burr Finish Experiment (Porting)

Interesting. I've not read anything on this finish so totally in the dark about it. Would this possibly even help on a dual plane intake even though you can't reach everywhere?


There’s plenty out there about the finish. Your eyes may glaze over after a while though!
This forum here has pages of discussion on it:

Why an engine makes more power off a burr finish - Don Terrill’s Speed-Talk