Nash/Rambler Lhead engine, a lower cost version of the Nash Flying Scot. (I think that name plays off the racistly notorious trope of Scots folks being cheapskates.) The whole thing is ridiculous.
https://tldr.nettime.org/system_nettime/media_attachments/files/113/409/708/340/599/790/original/6294929691c7c66b.jpg