F1-like engines
i used a 2015
2 liter V8 ,N/A,5 valve
and managed it to rev like 10200 RPM and i had like 300+ horsepower but torque was crap.
it was like a honda, got hp but no torque
i tried different bore and stroke size in order to be more than 45+ reliable with no quality sliders used
also bore and stroke
if bore is small or big it cant rev high
if stroke is small or big it cant rev high also
you need to find a perfect balance there
post some pics of your high revving engines