What do you consider low RPM’s
8k 9k
I mean pushrod motors were doing 8k stock back in the 60’s
They can work just fine in higher RPM applications, But in all honesty they sure as shit don’t need to spin fast to make power.
GM has made so many advances in the pushrod design and efficacy there is no need to change as of now.
look at the trucks for example, last I checked there is not another manufacture that makes a motor. be it a OHV or OHC that gets better MPG than the GM GenIII motors.