Jim, does an engine pulled before reaching its overhaul time count in the statistics? It's a long time ago but seem to remember we were pulling engines on the 76A after about 400 hours, at overhaul they were blueprinted. We operated them hard, always max EGT on take off with about five to seven landings per hour. Only ever had one engine blow up in flight over a period of some eighteen years in a fleet of six.