If your engine guy let that buy..I would tare it down 100% . And check every thing..looks like a nice peice and a ton of cash invested..but that is bad imagine what we can't see possibly..good luck..if you new everything was good..you could take some time and tape up the hole valley make foam plugs to push in to the lifter bushing.and grind them down and use a good vacuum at the same time.✌