I may have a 312 but I am not a sure yet. The engine is in my 1964 F350 and the guy I bought the truck from claimed it has a 312 in it. I think the block casting number is correct for a 312 (ECZ-6016 C) and it has a raised dot on the crank flange, but I will not know for sure until I pull the oil pan. The heads are (C0AE) heads and rocker arms are low ratio (5751066). After reading about the 312 I have decided that it may not be a suitable engine for a truck so I will most likely sell/trade it and try to get a “FE” or "FT" to put in the truck.

   The engine runs but needs to be rebuilt. I know the engine is rare but I am unsure what the engine is worth. So if it were a 312 would anyone be interested in it?