Final | time | 1. Malvin Whitfield | United States | 47.8s | 2. Hugo Maiocco | United States | 48.0s | 3. Herb McKenley | Jamaica | 48.2s | 4. John Voight | United States | 48.3s | 5. Angel Garcia Delgado | Cuba | 48.4s | 6. Gustavo Ehlers Trostel | Chile | 49.4s |
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Semi 1 | time | 1. Angel Garcia Delgado | Cuba | 48.5s | 2. John Voight | United States | 48.9s | 3. Gustavo Ehlers Trostel | Chile | 48.9s | 4. Carlos Monges Caldera | Mexico | 49.8s | 5. Guillermo Evans | Argentina | 50.8s | 6. Ramón Sandoval | Chile | |
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Semi 2 | time | 1. Malvin Whitfield | United States | 48.1s | 2. Herb McKenley | Jamaica | 48.9s | 3. Hugo Maiocco | United States | 49.0s | 4. Jaime Hitelman Reitich | Chile | 49.5s | 5. Guido Veronese | Argentina | 49.7s | 6. Máximo Guerra | Argentina | |
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Heat 1 | time | 1. John Voight | United States | 50.6s | 2. Angel Garcia Delgado | Cuba | 50.6s | 3. Ramón Sandoval | Chile | 50.7s | 4. Carlos Camargo Leon | Mexico | 51.2s | 5. Anastasio Zelaya | Paraguay | 51.5s | 6. Luis Modeste | Trinidad Tobago | |
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Heat 2 | time | 1. Guillermo Evans | Argentina | 57.3s | 2. Gustavo Ehlers Trostel | Chile | 57.4s | 3. Carlos Monges Caldera | Mexico | 1:04.9 | -. Argemiro Roque | Brazil | DNS | -. Evelio Planas del Rio | Cuba | DNS |
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Heat 3 | time | 1. Herb McKenley | Jamaica | 49.0s | 2. Hugo Maiocco | United States | 50.0s | 3. Guido Veronese | Argentina | 50.2s | 4. José Zelaya del Pilar | Paraguay | 50.5s | 5. Javier Sousa Diaz | Mexico | 50.6s |
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Heat 4 | time | 1. Mal Whitfield | United States | 49.2s | 2. Jaime Hitelman Reitich | Chile | 50.6s | 3. Máximo Guerra | Argentina | 50.6s | 4. Guillermo Gutiérrez | Venezuela | 51.2s | -. Jacinto Gonzalez Patterson | Ecuador | DNS |
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