Really?
You don't think a 5.3 towing a trailer up a hill at 80% throttle (with an AFR of 14.7), will be making way more power than a 6.2 at driving on flat ground at 20% throttle (with that same 14.7 AFR)?
But maybe you meant to also include "at the same throttle position", and I'm just pointing out little things.
...
Is this what you want to go with?
Ok...
1) 5.3 towing uphill at 80% throttle WILL NOT BE AT 14.7 no matter how many times you try to type this out. The 5,3 will be deep into fuel enrichment (depending on gear) and close to max power so there is no feasible way you can claim it is at 14.7 afr.
Ergo of course it will make more power than a 6.2 that is on flat ground cruising.
2) 5.3 L cylinder mixed at 14.7 air/ratio will make less power than a 6.2L cylinder at 14.7 afr because the smaller cylinder will have less fuel in it.
From 1 and 2 you can see that at part loads (where a 6.2 can be at a higher afr) it will have incremental efficiency over 5.3. The 5.3 has a small enough displacement difference that it will need more fuel to make same power as 6.2.
If this isn't the case, then there is no need to have higher displacement engines.
If every engine on earth that runs on Otto cycle makes the same power at every AFR, or at 14.7, then it must be an illusion when dyno sheets show that a stock 6.2 makes way more power than a stock 5.3 at wot (13.1 afr).
In your view, no matter what the afr is, the 5.3 and 6.2 should make the same power in virtually all conditions of driving. This is ludicrous beyond what the english language can accurately describe.
