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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | John Cooper | GBR | 50.5 |
| 2 | Gary Knoke | AUS | 50.9 |
| 3 | Roberto Frinolli | ITA | 51.2 |
| 4 | Edvins Zageris | URS | 51.5 |
| 5 | William Gairdner | CAN | 53.8 |
| 6 | Helmut Haid | AUT | 54.6 |
| Did not finish | |||
| Horst Giesler | GER | ||
| Did not start | |||
| Nicola Dagorov | BUL | ||
| Rank | Name | Nation | Time |
| 1 | Warren "Rex" Cawley | USA | 50.8 |
| 2 | Juan Carlos Dyrzka | ARG | 51.1 |
| 3 | Peter Warden | GBR | 51.6 |
| 4 | Joachim Singer | GER | 52.1 |
| 5 | Boguslaw Gierajewski | POL | 52.8 |
| 6 | Samir Vincent | IRQ | 54.0 |
| 7 | Kiyoo Yui | JPN | 54.7 |
| 8 | Michael Ryan | AUS | 58.0 |
| Rank | Name | Nation | Time |
| 1 | Wilfried Geeroms | BEL | 51.2 |
| 2 | Kenneth Roche | AUS | 51.5 |
| 3 | James Luck | USA | 51.7 |
| 4 | Jerom Ochana | UGA | 52.4 |
| 5 | Robert Poirier | FRA | 52.6 |
| 6 | Valeriu Jurca | ROU | 52.7 |
| 7 | Kimaru Songok | KEN | 54.5 |
| 8 | Manzoor Ul-Haq Khan | PAK | 55.3 |
| Rank | Name | Nation | Time |
| 1 | Salvatore Morale | ITA | 51.1 |
| 2 | Vasily Anisimov | URS | 51.7 |
| 3 | Ferdinand Haas | GER | 52.2 |
| 4 | John Hogan | GBR | 52.5 |
| 5 | Keiji Ogushi | JPN | 53.6 |
| 6 | Jose Cavero | PER | 53.7 |
| 7 | Karu Selvaratnam | MAS | 53.8 |
| Disqualified | |||
| Djani Kovac | YUG | ||
| Rank | Name | Nation | Time |
| 1 | William Hardin | USA | 51.3 |
| 2 | Victor Maldonado | VEN | 51.6 |
| 3 | Jaakko Tuominen | FIN | 51.8 |
| 4 | Jean-Jacques Behm | FRA | 52.2 |
| 5 | Keiki Iijima | JPN | 52.8 |
| 6 | Mamadou Sarr | SEN | 53.2 |
| 7 | Amrit Pal | IND | 53.3 |
| 8 | Imants Kuklich | URS | 53.3 |