I HAVE A 73 CHALLENGER 318,UNKNOWN HISTORY, SOME CHANGES
HAVE BEEN DONE PRIOR TO MY OWNERSHIP. TRYING TO FIND OUT IF
HEADS WERE SWAPPED/OR WORKED OVER. HOW CAN I TELL? ANY HELP? THANKS
Take off one of your valve cover and the numbers are located between the valve springs on one of the runners. These are cast in the head and not stamped.