Doesn't prove anything conclusive, but in the SUN 100 race my NA 2nd gen 13B powered RV-4 did beat a bunch of 0 - 360 powered planes of the same type (RV-4s & 6s). I think it is safe to say that a *properly tuned* 13B of any generation will equal or exceed the power of an O - 360. Where did your understanding come from?
FWIW, It is the definition of *properly tuned* that we are really discussing here.
Tracy
It's my understanding that NA non-renesis rotary installations produce less power than 360s, Perry Mick might have a word on this.