About ten years ago, I rebuilt the engine in my 1967 Galaxie and installed a Comp Cams high performance cam and lifters. Since the car is an antique, I don't put many miles on it, but noticed about 6 months later a severe misfire and oil burning. Eventually got to pull the valve cover off and was shocked to find that the intake valve on the #8 cylinder wasn't moving at all. For those of you who have ever worked on a Ford FE engine know what a pain it is to get to the lifters. Anyway, when i finally puled the lifter, 1/3 of it was gone! Literally worn right off. Thank god the cam lobe didn't suffer any damage. I contacted Comp Cams and basically asked if I could just buy one lifter. In spite of several attempts I never heard from them. Put the old Ford lifter back in and she's still running today. Probably apples and oranges but thought I'd share.