Help! 915 Head casting I.D.

[Clownbaby]

I have an odd set of 915 heads. Usually their are two main casting numbers on a 60's Mopar head; the model, and the production date. But on this set of heads there is: 2780915 10, and on another area it is stamped 2255. As I understand it, that would mean they were built on February 25th, 1965, but 915's were only produced for 1967.  Anyone have any ideas?  There is also a weird looking symbol on the front exterior of the head. It looks like a filled in letter M.  Any help is greatly appreciated.

[cudabob496]

I think they were made for more than one model year. There are different 915 heads. Mine,
before I had them worked on, came with 1.60 exhaust valves. The HP models had 1.72
exhaust valves. But its been 20 years, so I could be wrong.

[Chryco Psycho]

simply the best production head made , 1 year only & 440 only
not sure on the casting #, sorry

[cudabob496]

thought I read somewhere that they appeared on some 66 or 68 models, but could have been dreaming.


http://www.moparmusclemagazine.com/techarticles/5115_cylinder_heads/