Nailhead motors
Engine Serial No.
| Year | CID | Prefix |
| 1962 | 401 - 2 bbl | 2I |
| 401 - 4 bbl | 4I | |
| 1963 | 401 - 2 bbl | JR |
| 401 - 4 bbl | JT | |
| 1964 | 401 | KT |
| 425 - 4 bbl | KW | |
| 425 - 2 x 4 bbl | KX | |
| 1965 | 401 | LT |
| 401 - Riviera | LW | |
| 425 | LX | |
| 1966 | 401 | MT |
| 425 | MW | |
Head Casting No.
| Year | CID | Number |
| 1959 - 60 | 364 / 401 | 1185485 |
| 1960 - 61 | 364 / 401 | 1190415 |
| Late 1961 | 364 / 401 | 1196914 |
| 1963 | 401 / 425 | 1196914J |
| 1965 - 66 | 401 / 425 | 1374603 |
| 1966 emissions | 401 / 425 | 1374603E |
| Experimental | 425 | 1367912D |