I just purchased a couple of marine 312 intercepters.  One has a matched set of 113 heads and the other a missed matched set of heads...ED ECZ C and ECG T.  I've looked at Mummerts and Tims site for head casting #'s (letters) and do not see any listed as ECG T.  Anyone have any info on this casting?  Just curious.  Thanks,

   

1956 F100 Big Window 309ci Y-block,  1956 F100 small window 272ci Y-block

Greg.  Mountains of North Eastern CA