Open it up and check. I had a roller come apart years ago the engine ran fine seeing that there are 4 valves per cylinder but there was a intermintet tick I could not track down. When I removed the cover 1 exhahst rocker roller had come apart (it was still in place) and it destroyed the cam
so 1 cam and rocker later the car is back on the road.
And by the way the big parts of the roller are still mia down in the oil pan