[Beav]

I don't know if they still 'season' cast iron parts as they used to years ago, but I'm thinking the answer is 'no'. When rotors, drums, engine blocks and cylinder heads were cast, they were tossed in a pile outside the factory and allowed to 'season' for a year or so. This allowed the metal to stabilize and yielded a better machined product when completed. That's why so many engine builders prefer to work with used blocks, etc. - the castings are totally stable after having been hot and cold thousands of times. I suspect that now the piece is sent directly to the machining pile as soon as it cools down to a couple hundred degrees.