The difference of a well blueprinted and professionally assembled motor is real, lots of great examples out there. Unfortunately, getting one from the factory is just plain luck.
I feel I got one and was lucky. 2011 153" Pro. 2,500 miles and I have not touched the motor.
One hiccup with the throttle block and got water in it (playing in deep powder), one set of plugs a year ago and changed the fuel filter twice,, that's it.
Been a greatsled, , still thinking of a Indy Dan LR motor though.