Cam Theory and Application

Dynos are tools - unfortunately stationary tools that have thier own calibrations and technical limitations. Especially the old ones. I have worked at and managed a chassis dyno shop. I know how they are run, and how they can be manipulated.
I tuned my cars in the winter, on roads that still had snow banks. I raced year round on the street and with temps changing that's something you had to do. The only truth teller is a timed run on a track but yes, climate prohibits this in some places. That doesn't change the truth.