The date code looks like May 3 1956.  I'm sure replacement heads were cast.  Maybe it's simply a replacement.  The ports, valve size and chambers look right for 239.  Sometime toward the middle of '56 production, heads began to be cast without core plugs.


Lawrenceville, GA

No freeze plugs all early heads have freeze plugs, also G stamped next to the cast EBU

239

http://www.ford-y-block.com/cylinderheadchart.htm



Lawrenceville, GA

Anybody know what these are? in looking through my stock pile I found these, early heads no freeze plugs, stamped with a G after the cast EBU.