Here are You Tube videos of valve float and spring dancing.
There are a lot of others on there, but this will give you food for thought of whats happening inside your engine.
YouTube - Valve Float
YouTube - Valvespring at 7000 RPM
There are a lot of others on there, but this will give you food for thought of whats happening inside your engine.
YouTube - Valve Float
YouTube - Valvespring at 7000 RPM