Trick Flow small block heads

For grins, I plugged in a few guesstimated data points onto one of the Wallace calculators.
I used 24.85” baro, 91*, and 25% humidity....... and it spit out a correction factor of about 23%........which would correct 500hp(obtained in those weather conditions above) to 615hp.

Frankly, if that dyno shop is using corrected baro readings........ that would explain why it has a stingy reputation.
There’s about 5” of barometric pressure loss that’s not being accounted for.