Trick Flow small block heads

PRH said
I’m sure this will be opening up a can of worms...... but.....

If the dyno is sitting at 5200’ elevation.....the observed barometric pressure at the dyno shop was not 30”........ it would have been more like 24.50-25.00”....... which is a pretty huge difference.

30” could have been the “corrected” barometric pressure........ which is what the pressure would be if you were at sea level.
But that’s not a number that's used for any of the normal SAE corrections.

I checked his weather station against the national weather service. His said 29.9 and NWS showed 30.0. Here's the page from the NOAA. You would know more than me.

Also here is a current snap shot of pressure.

And here's a current US map