I've had a set of Udo Becker lifters in my 2332 cc for a couple years.
Ran the Web 86C for a year, then switched to the Web 226 (between FK46 and 47). Anyway, I switched back to the 86C last week and during disassembly I noticed that some of the lifters are pitted just a bit, much like stock lifters. Some also have a silvery sheen to the contact area, while others look good as new. The lifters still have the radiused crown, so I'm going to try them for a while longer with the 86C. Also, the lifter bores are still tight with no damage visible. Anyway, this is my first set of Beckers, so I'm not sure what the wearing will look like over time.
I will be trying one more camshaft later this summer, so I'll check the lifter wear again in a few weeks.
Has anyone, else seen this?