Question on head porting?

[mcbitch]

Anybody know why or why not to round the metal in the intake port between the intake valves? It is in the bottom of the intake runner and in most pictures of ported heads it is not rounded off.

[IHI-RHC7]

Sharp edges facing the direction of flow cause turbulance.
Rounding the edge slightly causes the incoming air to roll towards the opening valves with minimal turbulance.
Sharp points also have a tendancy to become stress risers, and lead to cracks in cast materials.