Those housings appear to be from What the street people call a "Semi Pport" Where a very small Pport is added to a side port engine and fed from the secondary runners. So you can run around on the stock like primaries for good milage, and when you need to show off a bit, you call up the Pport and side port secondaries.
Not big enough on their own to support much HP.
Lynn E. Hanover
In a message dated 5/10/2008 11:15:59 AM Eastern Daylight Time, silvius@gwi.net writes:
Joe:
There is a set of P-ports on ebay right now, the description does not call them that, but the photos show so:
Item number: 370050497473