I relied with my tips and tricks of hand porting heads. Greg, The reason I stated "don't take any material of the floor of the exhaust port" is when I lost flow #'s. I think most head builder's would call this a point of diminishing returns? You will pick up 8-10 cfm on the exhaust side by ovating/D shaping the 5.7 Hemi exhaust port to match a round flange header vs a square flange.