I still have a few more cool pics from the museum I visited in FL a while back. These are a few antique aircraft engines. I don’t recall the exact years or makes, but they are WWI era.
Check out the pushrod /rocker arrangement on the second pic. Looks like the outside of the tube acts as a “puller” rod for the intake, while the inner rod is a “pusher” for the exhaust strange but cool. Id like to see the cam compartment on this thing. Liquid cooled too- done in a very logical way. Too bad it wasnt running- I bet it’s quite a sight!