I've got several big block timing covers and they all have a different number stamping, 171HE24, 171EM06, 171EM27. Are these date codes and if they are how are they deciphered? Thanx

950B6B5E-DB3B-45A4-ADD8-E5FA54820455.jpegF5803AC1-34D3-4794-B66D-8DFE1AD6936B.jpeg

I love the smell of Deer guts in the morning, it smells like... VICTORY!