A quick search on performancetrucks.net for "broken valve" brings up valve spring failers from PRC, Comp and other big names all within the last year. Reliability and LS6 springs seem to hold there own for the FI guys running a smaller cam and there is quite a few on that forum.
With that said, i'm ok with running these in my DD and mostly timid driving style. I'll be sure to post if I manage to break one.
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