New Small Block Stroker Engine Noise

The rockers are Comp Cams Pro Magnum and they have .020" side clearance per pair. I have at most one adjuster thread showing below the rocker which is what I wanted so the oil hole would line up. I am also using the Hughes Engines rocker hold down kit. The head's push rod holes were clearanced during the build and the push rods do not hit the heads. The heads are closed chamber Edelbrocks. I removed the valve covers and there is no evidence of the rockers hitting. The noise does not sound like its on any one pair of rockers. Seems like the noise is consistent across all rockers.