MRL Performance 340, WOW!
There are a lot of dyno shops that "fudge" numbers. My dyno guy is third party and does things by the book. His dyno get calibrated once a week. Engines will always make more power on a dyno, but my race engines have proven to me they are making the right power. 3 of my race engines this year are points leaders so far with 7 wins total and nothing less than second place. Rock solid performers.
On the rings, my rings seat on the first dyno pull. It used to be it took 3-4 pulls to seat rings, and that was a bit of a pain. It took longer to get the tune but not any more.