Thanks for looking, everyone. I am in the process of buying a 327, which is in a 1967 C50 Dump Truck. It's got a 2 barrel carburator on it now, and it's pretty safe to say that the motor is older than the truck. I'm curious though, because the ends of the heads have a strange double rectangle marking on the ends of the heads. I've looked for information and asked a few of those who know better than I, but they've not seen them before either. Does anyone know what this is, or means? Thanks.
