Ferrari Classiche 2020 Yearbook Article

Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Image Unavailable, Please Login Was reading an article in the 2020 Ferrari Yearbook recently covering the Ferrari Classiche process for a 275 GTB. I noticed in the pictures a coating had been applied to the inside surfaces of the engine. In the past, I believe that this would have been Zinc Chromate on a 12 cylinder engine. It caught my attention after reviewing pictures of my 76 engine rebuild that appears to have the same red coating. Is this a part of the Classiche engine rebuild or was this applied originally at the factory when new?