"Buick Trademark(s) used with the written permission of General Motors"
| Block Cast # | Year | Displacement |
| 1343404 | 50-53 | 263 |
| Head Cast # | Year | Displacement |
| 1313766 | 50-53 | 263 |
| 1318766 | 50-53 | 263 |
| 1341075 | 1949 | 248 |
| 1302277 | 1940 | 248 |
A letter or number after the casting number as in 1165165 X or -3 may indicate a change in update in the casting. This would mean a higher letter would be a later production.
| Intake Cast # | Year | Displacement |
| 1320385-2 | 41 | 248 |
A letter or number after the casting number as in 1165165 X or -3 may indicate a change in update in the casting. This would mean a higher letter would be a later production.
