X STAMP = BLUE PRINTED QC20?

Does the X STAMP identify a QC20 4V 351 CID FORD CLEVELAND ENGINE ?

Besides the FALCON GT-HO PHASE 3 Our team has found X stamps on different parts of the 351C 4V Cleveland engine block whether its a D0AE-L D0AE-J D2AE-CA D Block or Square cast so far XY & XA & XB FALCON GTs saw this order sheet from Australian Muscle Car Sales that was with an XY Falcon GT for sale which identifies an X as a serial number order for a QC20 4V 351 CID FORD CLEVELAND ENGINE

Info wanted Nevertheless if you have an X engine or X plus number engine stamped on the block please contact us