NoNoNo boys
Power checks are predominantly the domain of high power radials and vee's
for example I do power checks on 1450 hp radials it is a pre flight requirement, I do believe we are probably talking different things here, I've run out of time.........but let me assure you power checks are relevant to all engines......If I want to know the general output of my TSIO520's I will do a power check..........read old Curtis Wright, Lycoming, Merlin and Packard manuals they will tell you all about it.
Gotta go
Smacko....goodoh for dogs