yeah, really it would have to be put to rest by a dyno test. Somebody, somewhere, that has a dyno will get a ton of views on youtube for doing this experiment!!! Calling Nick's Garage..... LOL
I just cannot see anyone paying dyno time to see what flipped CAST pistons will do. You'd have to have two otherwise identical engines, OR tear the same one down and flip the pistons and dyno it both ways. What a headache to find out a 3HP difference......OR that it looses power OR remains the same. Totally not worth it.