This subject has really been tossed around. Several observations, a good test would be with a quality engine. The Bluebird was cheap because it is cheap. A friend had one, a 28 as I recall, and it was the typacal Asian "cheapy". My friends engine was not reliable including a bad carb that leaked lots of air from new out of the box. My guess is that the rest of the tolerences were just as bad.
If this was a good engine quality wise then we all would have some.......They went away just like MDS.

Anything learned from this "test" applys only to this specific engine, period.

I GO WITH DAR AND HIS METHODS, THEY WORK AND ARE SAFE.