Some early aluminum intakes just don't have a casting number. That tripower intake in the pics I sent does not have one either. Just the firing order and the fomoco logo. Some have the date code by the thermostat outlet but mine did not. Iron intakes seem to be well marked for some reason. Well glad the pics helped out. Let me know if you need any better ones. These were some I had already but can take a purpose specific area if needed. G.