Chattering valves

[loudvalves]

:confused: I have a Curtis Sparks 416(12.1) in my 2000ex it has the hardened rocker arms, cam, titanium springs, trued and welded crank, port job, Sparks pipe, 170 jet and I run cam2 the motor does not run overly hot. I set the valves at stock clearance(.005 .004).
Any suggestions? I have e-mailed Sparks Racing but no response.