[D.Johns]

Like you stated the 4v has an advantage of valve curtain area. That is an inherent advantage of multiple valve engines. It also has an advantage of valvetrain stability at lower lifts for higher RPM. It also has disadvantages as well even on the valve area as it is a small bore so the valves are shrouded a somewhat. There are inherent pro’s and con’s to every engine architecture and vehicles chassis/aero. The LS and MOPAR as advantages in some aspects and the Modular has some in others. Valve curtain area is not the “smoking gun”. The combinations as a whole are close in the real world(not identical that’s for sure) but any combo could win any round. Everyone will continue to advance their program to eliminate or work around the inherent short comings and capitalize on their strengths.

Everyone will fight to gain an advantage over the competition. The rule makers usually try to keep the parity.(unless corrupt....)