Okay ..I just picked up a 4.6 intake allegedly from a 2004 Towncar just because it was cheap. The thing has the plenum sitting in what would normally be the lifter valley (it is an OHC setup). The individual intake runners look like an octypus off of this plenum. If you invert the intake you see 16+ ports. 8 have the injectors on them (square) and 8 oval ports that have butterfly plates in them. There are also 3 rectangular recesses in between each pair of oval/square ports that have what appears to be counter weights for the shaft that runs down each side of the intake. These shafts are acuated by a vacuum pod. This is in addition to the butterfly on the throttle body. This isn't anything beyond curiosity. I envision some type of neo-extra (as in pre or external)-combustion chamber "stratified charge" type thing.