Tucker air cooled flat engine video
 

I hope it's not a repost.
Tucker had some interesting flat engine ideas. Had it not gone bust, the American car industry would have been far more interesting for us rear engine flat 6 guys. :D
Reminds me a bit of lycoming engines.

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I dated a girl named Heidi Viemeister in the 60s. Her father, Read Viemeister was the body designer of the Tucker car. Her parents named her older brother "Tucker" because Read was so personally invested in the Tucker car.

https://en.wikipedia.org/wiki/Read_Viemeister

I am under the impression they were Franklins.

https://en.wikipedia.org/wiki/Franklin_Engine_Company#:~:text=The%20Franklin%20E ngine%20Company%20was%20an%20American%20manufactur er,Corporation%2C%20returning%20to%20aviation%20wh en%20that%20company%20failed.