I am telling my age with this one. Has anyone else ever seen or heard of the Arkun conversion that made the flathead valve in block engines into an overhead valve engine? I have only seen one in an actual auto and that was many years ago, it was a neat idea and it worked out fairly well.
It was designed and made by Arkus Duntov - yep, the same Duntov of Corvette engine fame.

Here is a link to a short read and some pictures of it.
https://www.museumofamericanspeed.com/ardunohvconversion.html

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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