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Hi
I would suggest that if it was a cams or rockers manufacturing issue you would have had 12 rocker failures or 11 rockers with signs of impending failure.
Limited or no oil supply from one spray hole is sure to cause a single rocker/lobe failure.
In my engine I identified the problem when adjusting the valve clearances and was able to repair by removing and cleaning the spray tube and fitting a replacement rocker.
Porsches later removal of the engine mounted oil cooler and fitting of a (pressure side ) oil filter has some merit.
Cheers
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