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I'm suspecting that Glyco's issue isn't with rod bearings per se, but rather than whatever quality issues have crept in just surface in the most highly stressed bearings, namely rod bearings. And that whatever level of quality is sufficient for main bearings.
Not much discussion on the layshaft bearings though. They are highly stressed in a 911 engine, and I've heard they often show copper on teardowns. Just curious if Glyco's offering is acceptable. I'm not hearing too much discussion on it, maybe that's a sign.
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