The problem I have with the two sizes is sealing it at the head. I'm not savvy to all the flow science but it would seems that flowing from the small intake into the large head might cause turbulence entering the head and slow the velocity of the charge because it would expand the fill the large port. The valves are the same size so that may not be the case. It's just metal and someone can modify the intake. Eddie Edmunds would not mind.
