"Buick Trademark(s) used with the written permission of General Motors"
| Block Cast # | Year | Displacement |
| 1231738 | 70-71 | 455 |
| 1238861 | 70-71 | 455 |
| 1241735 | 72-76 | 455 |
| 1242694 | 70-76 | 455 |
| 1381624 | 67 | 400 |
| 1381625 | 67 | 430 |
| 1383424 | 68-69 | 430 |
| 1383434 | 68-69 | 430 |
| 1383790 | 68-69 | 400 |
| 1384790 | 67-69 | 400 |
| 1393444 | 68-69 | 400 |
| 9773524 | 67-69 | 400 |
| Exhaust Manifold |
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| Casting # | Part # | Year | Displacement |
| 1377139left | 67 | 400/430 |
|
| 1376998right | 67 | 400/430 |
|
| 1245433 left | 67 | 400/430 |
|
| 1238094 right |
67 | 400/430 |
|
| 1245443 left | 69 | 400/430 |
|
| 1238094 right | 69 | 400/430 |
|
| 1233451left | 70 | 455 |
|
| 1238094 right | 70 | 455 |
|
| 1238094 right | 71-74 | 455 |
|
| 1233451 left | 71-74 | 455 |
|
| 123right | - | 455 |
|
| 1233899left | 455 |
||
| 1243457left | 455 |
||
| 1246669left | 455 |
||
| 1246671left | 455 |
||
| 1383549left | 70 | 455 |
|
| 1246715 left | 75 | 455 |
|
| 1238094 right | 75 | 455 |
|
| 1384089 left | 68 | 400/430 |
|
| 1383648 right | 68-70 | 400/430 |
|
| Stage I Casting Numbers | ||
| Head Cast # | Year | Displacement |
| 1240150 | 1970 | 455 |
| 1240146 | 1971 | 455 |
| 1238530 | 1972 | 455 |
| 1242002 | 1973-74 | 455 |
| The story behind these four numbers is in question! | ||
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.
| Head Cast # | Year | Displacement |
| 1231109 | 67-69 | 400/430 69cc Int 176cc Ex 134cc |
| 1231786 | 67-69 | 400/430/455 69cc |
| 1233472 | 67-70 | 400/430 69cc |
| 1233472 | 71-72 | 455 71cc |
| 1237661 | 70-71 | 455 71cc |
| 1238142 | 72-74 | 455 71cc |
| 1238142 | 75-76 | 455 76cc |
| 1238148 | 72-74 | 455 71cc |
| 1238148 | 75-76 | 455 76cc |
| 1238529 | 70-74 | 455 71cc |
| 1238529 | 75-76 | 455 76cc |
| 1238530 | 70-74 | 455 71cc |
| 1238530 | 75-76 | 455 76cc |
| 1240149 | 70 | 455 69cc |
| 1240149 | 71 | 455 71cc |
| 1240150 | 70-71 | 455 |
| 1241449 | 72 | 455 |
| 1241786 | 70 | 455 69cc |
| 1241786 | 71-74 | 455 71cc |
| 1241786 | 74-76 | 455 76cc |
| 1241860 | 72-74 | 455 71cc Int 176cc Ex 134cc |
| 1241860 | 75-76 | 455 76cc Int 176cc Ex 134cc |
| 1242445 | 72-74 | 455 71cc |
| 1242445 | 75-76 | 455 76cc |
| 1242455 | 72 | 455 |
| 1246322 | 72-76 | 455 |
| 1248922 | 72-74 | 455 71cc |
| 1248922 | 75-76 | 455 76cc |
| 1372963* | 67-69 | 400/430 69cc |
| 1377979 | 67-69 | 400/430 69cc |
| 1377980* | 67 | 400 69cc |
| 1382091 | 67-70 | 400/430 69cc |
| 1382091 | 71-74 | 400/430 71cc |
| 1382091 | 75-79 | 400/430 76cc |
| 1382983* | 67-69 | 400/430 69cc Int 206cc Ex. 142cc |
| 1382985* | 67-69 | 400/430 69cc |
| 1382986 | 67 | 430 |
| 1384720* | 67-70 | 400/430/455 69cc |
| 1384720* | 71-74 | 455 71cc |
| 1384720* | 75-79 | 455 76cc |
| 1385649 | 68-69 | 400 69cc |
| * Big Port | ||
1967-70 heads are 69cc, closed chamber. 1971-74 heads are 71cc, closed chamber. 1975-76 heads are 76cc, open chamber. In 1975 General Motors painted all engines corporate blue. A blue 455 is generally considered a more desirable motor to build. |
||
| 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 |
| 1247331 | 75-76 | 455 4bbl |
| 1299925 | 72 | 455 4bbl |
| 1374062 | 67 | 400/430 4bbl |
| 1376998 | 67 | 400/430 4bbl |
| 1382720 | 67 | 400/430 4bbl |
| 1383438 | 68 | 400/430 4bbl |
| 1386003 | 69 | 400/430 4bbl |
| 1386681 | 68 | 400/430 4bbl |
