I more commonly see the PR cup worn out than any issue with the big bore hole but I have seen that. All that said there is a newer style rocker assembly to improve oiling and ticking. The oil hole in the shaft is chamfered quite a bit in the newer ones to keep more constant pressure to the lifter and the wear surface in the rocker is larger. If I had some questionable ones I would buy the new set for both sides from the dealer... should be around $700 for all 4 assemblies.