How high do you rev your setups w/this spring?

Also, what cam are you using when doing so?

any stories of people breaking them?

I called them and they told me 7000-7200 is the limit of the spring and how far it was tested up to. I will be on that line but was wondering if others have been doing it for a long time w/no problems.

I'm trying to keep my valvetrain light as possible and I am using stock valves and stock rockers and they said that would help.