I was setting out to fly the first hour after the engine had been overhauled/IRAN work performed. New cam shaft, 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.