I hate reading Rennlist because there is so much cr@p to wade thru to find any content. What I did find from the links Gelbster posted was that the spec of the bearing, as Silber just said, was a
'light duty' bearing which had no place being used in an engine. 6204 spec. If what I read is correct.
Another interesting bit was the mention of counterfeit/sub-spec NSK bearings possibly being used by Porsche.
Edit: Looking further into the bearing info (I know nothing about bearings) It looks like the post on Rennlist wasn't exactly correct about the numbers in the bearing code, unless I misread.
This was a good chart to look over:
http://www.kykbrg.com/KYK%20pdf/Bearing%20Classification.pdf
My take-away is that Personally, I should leave bearing selection to others.