Hi All :-)
It,s been sometime since I, posted something on this Y-Block site. I, have a question on "Porting" It's been known for a long time that if a person cleans up the ports surfaces and ledges that Optimum flow can be achieved. With this being said is it just cleaning up the port holes so that there are No restrictions as the exh. air flow passes through? Or is making the holes in the ports of the  exh. manifold larger and enlarging the exh. ports in the heads a significant gain in performance? Thank you in advance for your interest and your help :-)

Jeff