As another data point, I have 550 hours on my Performance Engines IO-550 without problems and I know others with similar experience. Mine was not a racing engine.
Of course, posting this message will certainly induce the karma gods to make my engine fail on my flight tomorrow!
Dennis
Legacy, 550 hours
For what it's worth.... my experience mirrors Dennis, Gary and Lynn.... just over 550 hrs in 5 and 1/2 years on a Performance EXP (non-racing) with NO problems other than a precautionary replacement of the starter / coupling. Compression - 78/80, oil analysis every 25hr - looks fantastic, borescope inspection every 6 mo - NO anomalies, runs strong, clean and absolutely NO leaks of any kind.
I personally know of 3 others (not mentioned above) who have had virtually the same experience.
Don't get me wrong..... I don't think Ron Monson is a great guy by any means and I would NEVER recommend anyone to him. I just add my experience as another data point.
Erik Larson
Legacy N74FX