Very nice piece. It is a slight shame though that it had probably been polished somewhere in it's life and someone ground off the Firing Order and Part #. More than likely I would say that this is an over-the-counter service replacement because of the reinforced outer corner bolt holes (ears) that were very fragile and quite easy to break off. Although it's a disappointment that's it's missing it's separate valley cover, it's nice to see that the plenum under the carbs hasn't been butchered like so many others. The Z-11 Intake Manifold is in my opinion, the most beautiful manifold that Chevrolet ever produced.