Here is what Scott had to say. Sounds like it is precisely my experience here:
Hi Walt-
What you are seeing is in fact overlay fatigue and is a common problem with current Glyco rod bearings. We don’t use them in race or street engines. I have a direct replacement Clevite 77 H series bearing for part # 901 103 141 00- no need to change journal size or rods.
They are 290.00 for a set and are Calico coated . I also have them for 2.4-2.7 and soon will have them for 3.2 3.3 and 3.6
At this time the Glyco mains are fine
Scott McPherson
Automobile Associates of Canton Inc.
860-693-0278
Specializing in Porsche, Audi, VW, BMW and Mercedes with our Body Shop, Race, Restoration & Mechanical Services - Automobile Associates