Trick Flow small block heads

PRH said
When you go over there, ask him to show you what the current baro pressure is in the dyno room.
If it’s anything close to 30”...... you have your answer.

It’s pretty simple really........ there’s going to be 20-25% correction for that dyno shop(for SAE J607), depending on the day.
For example, at that location...... even on what would be considered a “good day”......25.15 baro, 65*, 10% humidity........ the correction factor is still 20%(500hp uncorrected = 600hp corrected).

If he’s coming up with corrected numbers that are in the 3-10% range....... they’re wrong.
Likely because the correction inputs are wrong.

That would be a classic case of GIGO.

Corrections in the 3-7% are what we typically see here on an average day....... and this dyno is only at about 400’ elevation.

Okay here we go. Thanks for your help. This would appear to me that this is corrected. I'm editing my original post to reflect this only. I was/am confused. Idk if my 510/520 was a earlier run but 2 of the pulls aren't saved or deleted. I can find a 2-4k pull that shows 518tq but that was with a different carb and 33* of timing. I think I know where the crazy number came from. There were hold over numbers in the manual entry tab and it showed 19 inhg in the pressure column?? I thought they were correction factors, so I clicked on it and then graphed it. Hence some of my confusion. I have zero Dyno exposure and it shows. So I apologise for some of this crazyness. Hope that helps.