Finned Norton valve covers, vented

On an Norton ATLAS engine we have for rebuilding we found a set of finned and vented valve covers. As we have another 2 engines to build we decided to let 10 sets sandcast in Aluminium. Please understand that this set is unfinished, ist just the raw cast. No holes drilled, no gasket surface planned. Surface is sandcast raw as the parts came out of the mould. The 2 front covers can be drilled for ventilation. See picture of the original part (not included). Set of 3 Norton valve cover castings 2 x front 1 x rear Raw cast, no machining.