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 |