While digging through the top of the tool box yesterday, looking for a zip tie, I came across a full set of hydraulic lifters I had purchased for a project about 12 to 15 years ago.

Would these still be good? They haven't ever been out of the boxes, but they haven't been stored in temp or humidity controlled location.

They are completely taped up, so I didn't want to break the seal since I don't have a time frame in which I will need them. But if they may still be viable I will add them to the parts shelf with the cam bearings they were purchased with.