I have a 427 side oiler with heads that have a C6AE-F casting code. I have seen some info that these heads have 2.195" intake and 1.733" exhaust valves and that the valve spacing is wider on these bigger valve heads. My question is, "What is the spacing for the smaller and the larger valve heads?" The heads are currently on the engine so I can't measure the valve diameter. I'm trying to verify if these are the heads I think they are. Any help is appreciated.