It was IO-540 in an Aztec. Gov failed on take off. About gosh 20 years ago
yr right,
If that engine was seriously damaged by going to 2900 RPM, when the T/O RPM was 2650 or 2700 RPM, there was something else seriously wrong with that engine.
I personally have had a governor control rod drop of on an IO-540, fitted to a 260C Comanche, fast as I pulled the power off and pulled the nose up, it went over 3000 on the tacho. The LAME who looked after the aeroplane, as per the manual, gave it the necessary going over, there was no damage.
Tootle pip!!