nanotech1 wrote: i was looking at some web site about the crosley engine
notice that cylinder and head section was made of brazed sheet metal (clip)
^^^^^^^^^^^
This goes back so many years, that I'm not sure my memory can be trusted,
but I recall hearing that that engine was originally intended to be
"disposable." It was parachuted into combat areas, never intended to have a
long life. It seems to me that was the explanation given for why it was
never a very good automotive engine.

That is not to say that a good engine could not be made using sheet-metal
stampings and precision cylinder liners.