yes they have been rubbing the head,mistake by me and engine assembler, they are 3/8s wall pushrods and have a larger cup size on top.the rockers i have are stock cast iron with the interference style adjuster...it has a small ball on them for the 5/16s pushrods small top cup. I have new crane adjusters with the small lock nut and new 5/16s proform chrome moly pushrods. should take care of that problem.