I have a SBC using vortec heads and Comp Cams Pro Magnum full roller rockers with poly locks. The problem is valve cover clearance. The stock valve covers were too short so I bought tall aluminum centerbolt valve covers off an E-Bay vendor. No name brand. The covers have ribs in the 4 places that the bolts go thru. The ribs should fit between the rockers, but they hit. Should i grind the ribs to clear? Or can someone tell me a name of valve covers that will clear? Yes the rockers are self-aligning type. I,d like to hear what ( 4x4high ) has to say. See pics.