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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Herman Frazier | USA | 46.09 |
| 2 | Mike Sands | BAH | 46.52 |
| 3 | Zbigniew Jaremski | POL | 46.68 |
| 4 | Peter Grant | AUS | 47.03 |
| 5 | Bryan Saunders | CAN | 47.24 |
| 6 | Carlos Norona | CUB | 48.46 |
| 7 | Hamil Grimes | BAR | 49.24 |
| 8 | Wilfrid Cyriaque | HAI | 51.49 |
| Rank | Name | Nation | Time |
| 1 | Fred Newhouse | USA | 45.42 |
| 2 | Richard Mitchell | AUS | 46.11 |
| 3 | Jan Werner | POL | 46.19 |
| 4 | Alfonso Diguida | ITA | 46.52 |
| 5 | Leighton Priestley | JAM | 46.74 |
| 6 | Don Domansky | CAN | 47.24 |
| 7 | Errol Thurton | BIZ | 48.91 |
| 8 | Ahmed Asiry | KSA | 49.72 |
| Rank | Name | Nation | Time |
| 1 | Maxie Parks | USA | 46.12 |
| 2 | Delmo Da Silva | BRA | 47.21 |
| 3 | Ivan Mangual | PUR | 47.39 |
| 4 | Karl Honz | FRG | 47.47 |
| 5 | Eddy Gutierrez | CUB | 47.89 |
| 6 | Renelda Swan | BER | 49.13 |
| Did not start | |||
| Antony Moore | FIJ | ||
| Stavros Tziortzis | GRE | ||
| Rank | Name | Nation | Time |
| 1 | Alfons Brijdenbach | BEL | 46.73 |
| 2 | Jerzy Pietrzyk | POL | 46.92 |
| 3 | Franz-Peter Hofmeister | FRG | 47.17 |
| 4 | Ossi Karttunen | FIN | 47.22 |
| 5 | Glenn Bogue | CAN | 47.42 |
| 6 | Raymond Heerenveen | AHO | 47.44 |
| 7 | Wavala Kali | PNG | 48.85 |
| 8 | Ricardo Larios | NCA | 50.52 |
| Rank | Name | Nation | Time |
| 1 | David Jenkins | GBR | 46.60 |
| 2 | Bernd Herrmann | FRG | 46.99 |
| 3 | Josko Alebic | YUG | 47.03 |
| 4 | Markku Kukkoaho | FIN | 47.67 |
| 5 | Charles Joseph | TTO | 47.72 |
| 6 | Samba Dieye | SEN | 47.98 |
| 7 | Bjarni Stefansson | ISL | 48.34 |
| Rank | Name | Nation | Time |
| 1 | Michael Solomon | TTO | 47.29 |
| 2 | Glendon Cohen | GBR | 47.77 |
| 3 | Alberto Juantorena | CUB | 47.89 |
| 4 | Alfred Daley | JAM | 48.04 |
| 5 | Fred Sowerby | ANT | 48.12 |
| 6 | Avognan Nogbourn | CIV | 48.24 |
| 7 | Jose Jesus Carvalho | POR | 48.47 |