So about 10k miles after rebuilding the engine the valve dropped, demolished the number 3 piston, and scored the liner. I'm in the process of tearing it down and seeing if I can rebuild it with the parts I have, but I wanted to do an autopsy.
- improperly done valve timing. I had just done an oil change and valve adjustment a week or 2 before
- malfunctioning IP. I bought the car with a destroyed number 3 piston, and bought a donor engine which I swapped in, but the donor IP didn't work, so I put the original on the swapped engine
- improper IP timing. The timing was never set correctly, just lined up with the mark on the housing. It smoked under moderate load, which I know realize was a very bad sign
- insufficient top end oiling. The donor engine's head was lacking a hole for the oil gallery. That problem presented itself pretty quickly (and the result was nowhere near as bad as this) so we drilled the whole out, verified oil was flowing, and thought that was good enough
Pictures attached. let me know what you think