Is the Thunder Racing set worth it and can it handle 500 or 600RWHP?

 

Rocker set meaning roller rockers I assume. Are you asking about the Crane Golds or the T&D's or a set of Jesels. The Crane's are worthless unless you have a low lift cam and don't want to change it. The T&D and Jesels are adjustable which is a plus but not needed unless you have a solid cam. Let me know what you are referring to by Rockers because I might not have answered your question. And all of the above options should handle 500-600+rwhp easily.

 

Funny phraseology. I'd say the Crane's are "valuable" & "worthwhile" with a lowlift cam. Not a great bang-for-the-buck, but they do open up the engine's ability to suck air in, since what they do is basically improve/speed up the ramp rates of the cam.

If I was going after that kinda rwhp, I'd be doing shaft mounts, and not the single posts.