When we were talking about it I seemed to remember that some abrasive compound that was used before assembly was not cleaned out completely, caused cylinder scoring from the first dyne runs onward...I was thinking about that situation.
I could NEVER afford it without dipping heavily into the rather skinny retirement fund, but one of those would be a great high altitude motor on my XTB. I'd go more conservative on the port timing but have appropriate compression to run on 91 ethanol free up here. At altitude, I am pretty sure that the best solution is not a smaller motor highly tuned, more cubic inches is better IMHO. A Sack-O-Cats motor with decent setup likely could do trips at sea level on the XTB. Since my ride has down riggers mounted, would set a world multi species boat speed record for Allison, hehe.