Figured y'all might enjoy reading this. If anyone can shed more light on the various experimental Ford engines, I'd like to read everything I can about it. This is one facet of Ford history that doesn't get it's full day in the sun.
Here are some x engine images...
And here is the patent . . .
Patent number: 1639333
Filing date: Aug 2, 1920
Issue date: Aug 16, 1927
There was also a watercooled verson! Bud.