Gerard, I will be very interested to hear your evaluation of these washers/nuts. i remember very distinctly my old 4779 had an oil weep at the cyl/head joint. Autumn 1970, i bought a SnapOn impact screw driver to remove the screws fixing exhaust flanges to head, so i could do a good cleaning because of burned on oil. my E2241 weeps similarly. despite fitting a "sticky" head gasket. Disappointing.... as i thought the "sticky" head gasket would do the trick. So, at some point, i'm going to have to pull the engine, so i can do what's necessary to stop the weeping. too bad the engine can't be dropped in the frame by removing the mounting bolts in order to remove the cam cover.