R500owners.com long gone I'm fairly sure.
The package that Caterham developed when the R500s were going bang was certainly belt and braces...rev limit (I think it was 9200 down to 8600), bearings, mini-apollo, cooler, rad, ecu controlled fan. They didnt really know what was going on or how to fix it, but they had to so do as it would cost them a fortune otherwise (and to some degree it did). As PC says it was the change of bearing that made the big difference.
I think it's fair to say that Richard Ince spent a lot on R500 engines!
Those were the days. Dont get that kind of thing these days with new Caterham developments!
Graham