One more thing that I learned today...
The likely cause of the valve spring failure was the engine sitting for so long after being assembled. The motor was originally built back in 2007 if I remember correctly. I didn't fire it up until 2013. So there's a good chance that a few valve springs were compressed for 5+ years. It seems that can cause springs to weaken and ultimately fail. Makes complete sense, but not something I would have thought of...
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