(…) I was setting out to fly the first hour after the engine had been field overhauled / IRAN work performed. New camshaft, lifters, bearings, connecting rod bolts, rings, and honed cylinders. Fresh zero-time propeller and prop governor. We had started the engine 3 times and made sure everything was in great shape before this 4th time. I performed a runup and everything was looking good, so I took off to break in the engine. It ended up breaking instead. Source: Edward Frye on ‚Youtube‘.