Like I said in an earlier post, some rocker/shaft assemblies are better than others. There has been much debate here on Club Cobra, with many opinions, on what is best for an FE.
So, what is Roush using, that Keith doesn't like, and what are some brands that are acceptable for an FE?
Mine are "blue",
I forget what brand that is but they've been working out nicely for many thousands of miles now. Maybe I just got lucky, they came with the engine.