So do you think there is a real significant difference in terms of power output between the old and new engine? Or was the effect only placebo ( you know, nova produce a new engine, people think it is "new" and must be more powerful, so when they run it, they think it is more powerful where in fact it is the same. or the difference is insignificant.)

By the way what is the conrod length and stroke ratio? Haven't heard of it? How does it effect the performance?