Seen that before when fookers dunt change both cam and followers at same time. If yer lifters have a big dish on them chances is thats what happened. Yer photo's not clear enough to tell if thats the case, but old followers destroy a cam.
Yes but what about the bit of the cam that aint part of the cam anymore. Would be interestin to know what all them little bits of metal have been doing to the rest of the engine????