Hi Dwayne: Dyno operator predicted the results within a few hp and vp confirmed the results were within their files as well.
Changing timing did offset some of it, but we couldn't make up the losses.
97 Degrees outside temp, 60 percent humidity - lousy hot/humid day.

carb/timing all dialed in etc.

On the race car 511 , switching from regular old 110 race fuel to c12 and adding 2 degrees of timing- car picked up just as Vp predicted , i think we cut .02

Could we be talking about the differences in being in lower mean altitude and in very hot /humid climate compared to there?

Im certainly confused as to why your dyno experience ( which is more than mine ) would be widely different than we see here.
Jessie ( engine builder chebby guy that owns the local speed shop and is at the dyno often ) confirmed that he see's similar inn playing with fuels/engines at the same dyno.

So, i'm really confused on the differences.

For instance, we tried c16 in the race car and it fell on its face .

Very interesting to say the least.