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Buick Big Block Casting Numbers, 400, 430, 455
| Block Cast # | Year | Displacement |
| 1231738 | 70-71 | 455 |
| 1238861 | 71-72 | 455 |
| 1241735 | 72-75 | 455 |
| 1242694 | ?-? | 455 |
| 1364705 | 67-69 | 400 |
| 1381624 | 67-69 | 400 |
| 1381625 | 67-69 | 430 |
| 1381825 | 68-69 | 430 |
| 1382201 | 70 | 455 |
| 1383424 | 67-69 | 430 |
| 1383434 | 68-69 | 430 |
| 1383790 | 68-69 | 400 |
| 1384790 | 67-69 | 400 |
| 1388624 | 67 | 400 |
| 1393444 | 68-69 | 400 |
| Intake Manifold Cast # |
Year | Displacement |
| 1231718 | 70 | 455 4bbl |
| 1236403 | 71 | 455 4bbl |
| 1239925 | 72-73 | 455 4bbl |
| 1243020 | 72-73 | 455 4bbl |
| 1244302 | 74 | 455 2bbl |
| 1245059 | 72-74 | 455 4bbl |
| 1245375 | 72-73 | 455 4bbl |
| 1247330 | 75 | 455 4bbl |
| 1382720 | 67 | 400/430 4bbl |
| 1383438 | 68 | 400/430 4bbl |
| 1386003 | 69 | 400/430 4bbl |
| Exhaust Manifold Cast # |
Year | Displacement |
| 1238094 right 1245433 left |
67 | 400/430 |
| 1238094 right 1245443 left |
69 | 400/430 |
| 1238094 right 1233451 left |
70 | 455 |
| 1238094 right 1233451 left |
71-74 | 455 |
| 1238094 right 1246715 left |
75 | 455 |
| 1383648 right 1384089 left |
68 | 400/430 |
| Head Cast # | Year | Displacement |
| 1231109 | 68-69 | 430 |
| 1231786 | 69 | 400/430 |
| 1231786 | 70 | 455 |
| 1237661 | 71 | 455 |
| 1238148 | 70-72? | 455 |
| 1238529 | 70-76 | 455 |
| 1238530 | 72 | 455 Stage 1 |
| 1245713 | 69 | 400/430 |
| 1240144 | 70-71 | 455 |
| 1240145 | 71 | 455 |
| 1240146 | 71 | 455 |
| 1240149 | 70-71 | 455 |
| 1240150 | 70 | 455 |
| 1241860 | 73-74 | 455 |
| 1242001 | 73-74 | 455 |
| 1242445 | 70-72 | 455 |
| 1242449 | 72 | 455 |
| 1246322 | 75-76 | 455 |
| 1246332 | 75-76 | 455 |
| 1248922 | 72-76 | 455 |
| 1250489 | 75 | 455 |
| 1372963* | 67 | 430 |
| 1372985* | 67 | 430 |
| 1372986* | 67 | 430 |
| 1377979 | 67 | 400 |
| 1377980* | 67 | 400 |
| 1382091 | 68 | 400,430 |
| 1382720 | 67 | 400 |
| 1382983* | 67-68 | 430 |
| 1382985* | 68 | 430 |
| 1382986 | 68 | 430 |
| 1384720* | 68 | 400,430 |
| 1385649 | 68 | 400/430 |
| * Big Port, 69cc | ||