you may have heard of the Type F engine, very loosely based on the 235, although there were earlier versions, Type A and B, based on older stovebolt designs .... not much similarity
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics