Originally Posted by Mr. Niceguy
Change "rotating assembly" to lifters, rockers, intake valves, valve springs, etc. and ask the same question.
The valve train is housed under the valve cover that has a sealed valve cover gasket. Same with intakes; they have a gasket which makes them a sealed component. Parts that are exposed to air and humidity tend to rust, even with oil on them and I know some gun oils are better at preventing rust than others. So the same question remains.
Nevermind: answered above.
would like to see the results of some tests though.