High RPM Issue on Dyno

What cam, valve springs, pushrods and rocker arms?

Cam is a mechanical comp cams 260/[email protected], .580/.600

Valve springs is PAC Racing Dual Valve Springs with this pressures:

Outside Diameter of Outer Spring (in): 1.550 in.
Coil Bind Height (in):1.140 in.
Spring Rate (lbs/in): 363 lbs./in.
Seat Load: [email protected]"
Open Load: [email protected]"
Up to .650 in. lift @ 1.880 installed height.

Comp Cams Chromemoly Pushrods, Tube Diameter 5/16 in and Wall Thickness 0.080 in.

Proform Rocker arms 1.5 ratio...