Not a single individual posted enough information about their HP claims to make any comparison.

 

For Aviation purposes, HP ratings are reported at a standard - sea level (baro 29.921" Hg, 1013.25mb), 59F (15C) and 0% humidity. 

 

SAE HP ratings are reported at a standard, too - baro of 29.235" Hg (990mb), 77F and 0% humidity.

 

What does that mean?  It means that aircraft engines at the aviation standard show HP numbers that are 5% higher than SAE standard.  Wait, what about water vapor?  At 50% relative humidity, there is about a 2% loss in SAE HP, somewhat less if one is comparing to the aviation standard.

 

So, are all these dyno reports corrected for the conditions under which the run was made?   To SAE standards or the aviation standards? Or, to California standards?  After all, if the test cell was using cold induction air on a high pressure dry day the results, without correction, are optimistic and the same engine at the same test cell, using warm moist air on a low pressure day would show a much lower HP if the data were not corrected to some standard.

 

See http://wahiduddin.net/calc/calc_hp_dp.htm , for example.