I'm interested too.
More specifically on the exhaust side.
The exhaust lobe/lifter/pushrod has to open the exhaust valve against both cylinder pressure (times valve head area) and the valve spring pressure all multiplied by the rocker ratio.
The additional exhaust airflow at high lift may not be worth all the extra valve train strain and losses. The exhaust is going to exit under much higher pressure, and overlap is at low lifts defined by duration and LSA.
The Intake opens into an evacuated chamber, and only has atmospheric pressure to push air into the chamber (NA).
Many race heads will use smaller exhaust valves so a larger intake can be installed. Larger intake has more curtain area (area for overlap and flow), where the smaller exhaust valve takes less pressure to open against the post ignition cylinder pressure.