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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Gerhard Hennige | FRG | 49.5 |
| 2 | Geoff Vanderstock | USA | 50.6 |
| 3 | Viacheslav Skomarokhov | URS | 50.7 |
| 4 | Victor Maldonado | VEN | 51.4 |
| 5 | Kiyoo Yui | JPN | 51.5 |
| 6 | Robert McLaren | CAN | 51.8 |
| 7 | Miguel Olivera | CUB | 51.9 |
| 8 | Mohamed Asswai | LBA | 54.3 |
| Rank | Name | Nation | Time |
| 1 | Juan Carlos Dyrzka | ARG | 49.8 |
| 2 | Roger Johnson | NZL | 51.3 |
| 3 | John Cooper | GBR | 51.4 |
| 4 | Mamadou Sarr | SEN | 51.5 |
| 5 | Wesley Brooker | CAN | 51.5 |
| 6 | William Quaye | GHA | 51.6 |
| Rank | Name | Nation | Time |
| 1 | Ronald Whitney | USA | 49.0 |
| 2 | Rainer Schubert | FRG | 49.1 |
| 3 | Gary Knoke | AUS | 49.8 |
| 4 | John Sherwood | GBR | 50.2 |
| 5 | Wilhelm Weistand | POL | 50.7 |
| 6 | Wilfried Geeroms | BEL | 51.2 |
| 7 | Santiago Gordon | CHI | 52.4 |
| 8 | Abdul Zambrose | MAS | 53.2 |
| Rank | Name | Nation | Time |
| 1 | Roberto Frinolli | ITA | 49.9 |
| 2 | David Hemery | GBR | 50.3 |
| 3 | Robert Poirier | FRA | 50.5 |
| 4 | Jaakko Tuominen | FIN | 50.6 |
| 5 | Kimaru Songok | KEN | 50.6 |
| 6 | Alejandro Sanchez | MEX | 51.6 |
| 7 | Juan Garcia | CUB | 51.8 |
| 8 | Georgios Birbilis | GRE | 52.6 |