|  | 
    Ford Block Casting Numbers   Ford Casting Numbers Explained Casting numbers tell when a part was ORIGINALLY designed.. Example: The breakdown of casting number C8OE-9430-D is easy using the charts below: C = Decade of 19608 = Year of the decade (8th year of 1960), 1968
 O = line / Manufacture code
 E = Engine engineering department
 9430 = Basic number for an exhaust manifold
 N = Design change
 Casting Number Breakdown Chart Decade of Manufacture:A = 1940
 B = 1950
 C = 1960
 D = 1970
 E = 1980
 Year of DecadeThe year of the decade is determined by adding a number (0-9) to the letter of the decade.
  Example: C6 would be 1966, D0 would be 1970, D1  1971 |  |