wait wait wait - you got something wrong there:
as far as we know right now at the moment, OS X Lion does run on a single core processor. It also runs on any 32 bit CPU (although Apple claims, that the developer preview needs a 64 bit CPU - but it runs fine on 32 bit ones)
However Lion is still in its development, so those requirements might change after OS X Lion reaches it's final build version.
If you want, you can check my "Lion on S10(e)" thread - Me and some others currently try to run Lion on our S10(e)s!
Ideapad S10e black - OS X Snow Leopard & Lion - genuine Apple Atheros Airport card