I have true roller rockers and a pretty high lift cam. My stock cast aluminum valve covers just barely fit and actually touch a couple of the locknuts that hold down the rocker arms. The rocker arms do not touch the valve cover at any time. However, my question is: does there need to be more clearance between the rocker arms and the valve cover for oiling purposes.
Note: I have about 50 hrs on the set up and all looks fine.
Flying Tomato