I have no idea of what it is, but I have to say that I would run that on something if I could figure out how!
Well I am trying to determine that too. LOL 6 intake ports on a very odd configuration. What does the manifold say on the runner?
Are the intake ports really in a V configuration, looking straight into the ports on the intake flange ? - ............... - .. - .......... - .... - ..... -
It looks like the intake flange is on a flat plane so it would point to a 6cyl pancake design. Like Rich, I'd say euro something. .
I doubt that even is for a engine. No vacuum ports , the rectangle ports would not seal that well with stud holes on one edge of flange.