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This may or may not be the right answer, so it's your call.
When putting these motors together some had developed bent pushrods, so the stated method is to place the crankshaft in a position that will not stress the valvetrain during initial cranking. If this was recently rebuilt, it's possible that wasn't done and the rocker was stressed. You only need a slight crack for it to progress over time into a full break. If it was mine, I'd take the chance that is what happened, replace the rocker and its plastic retention clip, and see how it goes.
Considering the running time, I'm presuming its not a rust issue. Hung up from rust would leave marks.
Well I don't want to over exaggerate it but mine looks like new compared to the picture you posted. I mean the push rod isn't bent I know that for shore. If there's no markings on the piston does that mean the valves are fine? Or could they still be bent?
That appears to be a lathe shaved piston, but used the normal smooth piston should be full black. If the valve did not hit the piston it would not be bent from that. If it was mine I’d pressure check the injector as in the video, and try a new rocker arm.
I had a rocker arm break. It was weird. Drove in from Louisiana one night, no problem. Started it up the next morning and it was banging like crazy. 70K on it since then with no further problems.
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