No spellcheck on this thing. Yes - its Dyno testing but mainly to ensure it works under a load and runs at the temps & compression within spec. My concern was that if I was going through this whole process that I'd want to know affirmatively that the motor was indeed ready to install without leaks by having it under load for 3-hours and not overheat or blow something. So in the truest sense of Dyno testing, thats the wrong word but I don't have another one.