I had a rocker go on mine while it was being mapped. Just the rocker broke, no studs pulled or valve damage. The rocker broke into 3 or 4 bits but didn't cause any damage. I was missing one bit which I found resting in the sump when I took it down to check.

I searched about and concluded there wasn't a tested upgrade available so replaced it with standard and so far its held together.



Edit to add. My rocker broke when I was running a piper 285t2 cam, hydraulic lifters and kent HD springs. Now running newmans ph4, solid lifters and standard springs.