In the current build, when you open the Summary window in the engine designer and hit "Apply" it changes the values for "Bore" and "Stroke". No matter what values you enter in, when you hit "Apply" it will change them.
I've tried this with a few new games in both 1900 and 1930 and it's happened every time.
I've tried this with a few new games in both 1900 and 1930 and it's happened every time.