It is possible that the adjustment screw on the rocker arm has loosened.
Or the rocker arm was not getting proper oil and the bushing on the rocker arm has badly worn.
Or the valve spring has broken so that the tappet was being slapped hard by the cam lobe. If spring is broken, the valve does not follow the cam so there may be too much slop in the push rod and it jumps out of place.
This same thing happened to my 401 Ford 9000 diesel...valve lash adjustment screw had backed off, the push rod was badly bent. It sure sounded bad, and it was very sudden. We towed it home to the shop.
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