Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec oval port intake question

Can't port the 3L lower enough to fit because the 3L lower intake is plastic, and it has a smaller cross sectional area than the split port manifolds.
The oval port heads have a larger inlet to the heads.

I don't think they are any better than comparably ported split port heads, just cheaper. And of course, they are what are available with a cam driven waterpump.