| Final | time | _____________________ | | 1. |  United States | 41.0s | | | Don Campbell, Richard Attlesey, John Voight, Arthur Bragg | | 2. |  Cuba | 41.2s | | | Jesús Farrés O'Farril, Angel Garcia Delgado, Raúl Mazorra Zamorra, Rafael Fortún Chacon | | 3. |  Argentina | 41.8s | | | Mariano Acosta, Fernando Lapuente, Gerardo Bonnhoff, Adelio Márquez | | 4. |  Chile | 42.3s | | | Leonel Contreras, Rodolfo López Neira, Gustavo Ehlers Trostel, Fernando Salinas Acuna. res: Jorn Gevert | | 5. |  Colombia | 42.8s | | | Aristipo Lerma, Armando Muñoz, Alfaro Parra, Jaime Aparicio Rodewaldt | | 6. |  Peru | | | | Oscar Maldonado, Santiago Ferrando Dietz, Miguel León Pizzarro, Gerardo Salazar |
| Heat 1 | time | ___________________ | | 1. | United States | 41.3 | | | Don Campbell, Richard Attlesey, John Voight, Arthur Bragg | | 2. | Cuba | 41.7 | | | Jesús Farrés O'Farril, Angel Garcia Delgado, Raúl Mazorra Zamorra, Rafael Fortún Chacon | | 3. | Argentina | 41.9 | | | Mariano Acosta, Fernando Lapuente, Gerardo Bonnhoff, Adelio Márquez. res: Enrique Beckles | | 4. | Chile | 42.2 | | | Leonel Contreras, Rodolfo López Neira, Gustavo Ehlers Trostel, Fernando Salinas Acuna. res: Jorn Gevert |
| Heat 2 | time | ___________________ | | 1. | Colombia | 43.2s | | | Aristipo Lerma, Armando Muñoz, Alfaro Parra, Jaime Aparicio Rodewaldt. res: Gustavo Fajardo | | 2. | Peru | 43.3s | | | Oscar Maldonado, Santiago Ferrando Dietz, Miguel León Pizzarro, Gerardo Salazar. res: Eduardo Laca,Hernán Alzamora | | 3. |  Paraguay | 43.8s | | | Celso Gonzalez Brinzuela, Alfredo Rodas, Fermin Villalba, José Zelaya del Pilar. res: Miguel Paredes,Anastasio Zelaya |
| DNS | time | ___________________ | | -. |  Brazil | DNS | | | Helio Coutinho da Silva,Wilson Gomes Carneiro, José Telles da Conciecao,Antonio Moreira | | - |  Venezuela | DNS | | | Juan Leiva, Guillermo Gutierrez, Germán Garrido, Teófilo Davis Bell |
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