Why did I say two-wheeler? Oh well, it was 2.5yrs ago.
It was interesting to see the shrouding of half of each valve, and the trade-off between breathing and compression ratio.
Hotrodders relied on the junkyards being full of obsolete flatheads and GMC 6-71 superchargers. That combination breathes as well as a naturally aspirated overhead valve V-8.
There's also the sage of the
french military flathead.