SRDmotorsports

here on a slightly angled shot of the same exhaust port we can see the short side radii better
and how it is contoured and slightly widened
and light trail in the pic shows the whole exhaust port being a gradual smooth bend to promote higher exhaust exit speed
if always been a proponent for high exhaust exit speed on the heads i work on and the reasons are
1- it has the capability to improve Volumetric Efficiency across the board (if the rest of the engine is good)
2- it becomes less sensitive to good or bad exhaust/header (ofcourse a better header will have good gains)
3- it lets you take advantage of not needing the biggest exh valve or exh. duration/lift
4- with the engine being able to expedite spent gasses, it generally runs less hot or wastes less energy