Jon - Can you post a picture of the intake port at a different angle - maybe a little more from the side? - something in the picture does not look right (Like there's a huge ledge in red compared to the intake port to the right).
The intake port on the right (not red) looks quite a bit different than my ALH intake ports.
I defer back to Alex22's work where there were "significant" reductions in swirl with any major changes in porting at useable valve lifts (under 0.400"). The most gains were had with valve seat angles and back cutting the valves per Alex. This is also on an AHU head so comparisons may not be 100% accurate.
Regarding the exhaust port - I outlined in Green more/less what I did.
There was quite a bit of "hourglass" shape right above the exhaust seat which I removed completely so the port is the seat ID all the way up to the ceiling. This was on the sides of the port as well as the outside radius as well so it's a lot of material to remove all the way along the port. I kept the valley's on either side of the guide, just made them deeper and wider and blended them into the wider walls. The outside radius is probably a little sharper than I drew in the picture - Follow the outside of the green line in the vertical areas and the inside of the green line in the horizontal areas. To match the port on the exhaust gasket the "floor" on the short side radius was lowered. In hindsight, maybe I would have left short side radius alone (where the red stops in the picture) and tapered the floor out to the gasket dimension. Basically connect the end of your red line to the end of my green line. The crossection was enlarged significantly on the outside radius so there was probably little benefit (and probably some detriment) to taking as much out of the short side as I did.
This is all just my intuition - I have no data to back this up. For all I know I reduced flow in the exhaust port.
