you are definately in need of a laxative.

If you'd ever flown an O-200 you would realise that you are wrong.
did you know that at 4,000rpm they deliver 150hp.

great little engine.

Stealth ( O-200 powered) Pilot

But running it that RPM would take the TBO down drastically. I grew up
in Miami, and used to hang around Tamiami airport. All those Pitts
guys used to overspeed their engines like that. And most of them got
around 300 hours before they needed to overhaul their engines.
Those kinds of RPMs are okay for racing and aerobatics, but be ready
for a very early overhaul.