Nascar valve spring @7000rpm

[D_Eclipse9916]

The dual spring setup is so that it can control a higher lift and duration cam. I beleive that is what they are running there, but I didnt watch the video. As far as I knew about valves was that that spring was supposed to seat on the valve "seat" and the only other movement other than down and up was the spring turning on seat. I could be wrong.