No dyno guy ever said “hey, my dyno reads a bit hot so don’t worry about the numbers”. Everyone always has a stingy dyno when the numbers don’t meet expectations. I was watching a BBC on a chassis dyno...must have been 2006 or so. Anyway, it was on the dyno for hours and they beat 985 crank hp out of it. Single 4, 572 inches so that was pretty good. And that was in the guys car, with his headers, ignition and all that. The dyno guy was getting tired of all the bitching by the car owner so he said “I’m going to make a major tuning change, and if it works it will make a big number and if it doesn’t it’s tapped out”. They made 3 more pulls and boy howdy, there it was 1020-1030 on the three pulls. The owner was ecstatic that his stuff went over 1000 hp on a single 4. While they we loading the car up I asked the dyno guy what the big change was to get that power. He said I didn’t change a damn thing. That was as good as it was going to get. I just adjusted the correction factor in the software to shut him up and make him happy. I suppose it happens more often than not.