I have some heads that I pulled off of a 318. I compared them to 74 318 heads and the valves are larger. Under the valve cover of the first one had the numbers 2658920-3 and 10316. On the other side of the head there is a big X on one side and a 3 on the other. On the second head, there is a AAWJ, a 380(possibly 360?), a 123, 1063, and 36715873. On the back side of the head it says 3671587-3. Are these "X" heads since the one has the big X? These both look identical but Id think they would both have X's. Any help would be appreciated! Thanks!
