How about two of those on a single flat-plane crank?
Engine layouts
Angel Edwards
Juan Lopez
Apparently DUHC engines are actually a thing that exist(ed).
Pic related is a Talbot Lago engine.
I wonder why it's not more common. With a gear drive it would be robust and allow the exhaust and intake cam to be adjusted independently.
Gabriel Jenkins
isn't a Bugatti 8.0 basically 4 of these?
Cooper Taylor
Yeah, it's like 2 of them sandwiched front-to-back with 4 turbos strapped to it.