Normally aspirated, rear engine 2300 hours, front engine 2200 hours. In both cases the engines were still performing fine. The rear was exchanged with a factory reman because the mechanic was concerned about continuing to approve it. The front developed a crack in the block. Treat them right, use them consistently, don't let them sit, one pilot at the controls and these engines will provide you with plenty of life.
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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