[Yoyodyne]

Did Ford announce the switch to domed pistons as an improvement, and did they say what was better about them? They continued until the end of flathead production through several other major revamps of the engine, and the heads had to be more difficult to make, so it seems they saw a clear reason for doing so. I don't recall seeing anything in the literature that I've seen for that era that mentioned this, does anyone here know this?
I've always sort of thought that flat would be better for performance, and it's clearly better to achieve uniform piston to head clearance. Ford never did anything at random so I'm curious about Ford's reasons.