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.

Are you sure about the RPM's contribution to the 300 Hr overhaul?
I would imagine that crank stress due to gyro maneuvers, and full power
climbs followed by immediate power off maneuvers might be a more
dominating factor to short time between overhauls.

Mike