Nice work, no doubt. The last bench testing I did on 'low floor' ports I found the area in the chamber along the shortside radius was pretty sensitive because it is a continuation of the shortside. I would be curious how much flow would be affected (negatively) if you milled the chambers to the intake seats. I believe the middle peak between the valves ADDS flow when done correctly so, i would think the newest casting would be capable of higher cfm. However, that area appeared less 'sensitive' than optimizing the chamber wall side transition form the valve seat.