I saw a mothballed Hiller helicopter with a vertically mounted Franklin flat 6. At least the rudder pedals were marked HILLER and the individual valve covers had Franklin script on them. I traced the intake manifold to be a U with the vertical branches feeding each cylinder and meeting at the vertex of the U. The top of each branch was closed off with a 3-bolt flange. No carbs. Do the carbs mount to the tops of these branches? If so, what's the point of the branches meeting at the bottom?
My guess is that it would have looked like the douvle row helicopter in the attahced pic when it was flightworthy. Or it was built for Shaq
Thanks,
Sixto
95 S420
87 300SDL