Valve size effect on engine caractaristics

Hey!

Yet another topic more to the theory of stuff than a specific case

Lets take a 3L 2JZ as example

What effect dose a smaller and a bigger valve have on the engine behavoiur, not just peak power but idle, crusise, econnomy, efficiency, low end power top end power ect.

So lets take it to the exstreemes first and say we put 2x oversize valves in in one case

And half size valves in in the other case

What effect would it have and why under each conditon?

Same question i would also like to know when we talk porting, runner size ect because i assume the effect is similar?

Lets keep it to valve size specificly and the science behind it

And then maybe also take an example of the normal +1mm valves as well and the pro and cons of it at the end

I have a few theories but i would like to keep the floor open to people who realy know detailed and founded arguments and reasoning!