It's really not a split port design. The only thing that it has that allows it to be used with a split port LIM is a 1/4" section that's like an adapter plate at it's mating surface. The runners are a decent sized oval, which is why I chose to use it with my "tumble" port heads like you may use.
I'll have to look for some of my pics of the UIM when I was porting it.
