| Final 03.07 |
| | 1. United States | 3:23.71 | | Rowdy Gaines 50.41s, Jack Babashoff 1:41.67, John Newton 2:32.38, David McCagg | | 2. Canada | 3:29.64 | | Graham Welbourne 52.96s, Alan Swanston 1:44.88, Bill Sawchuk 2:37.33, Peter Szmidt | | 3. Brazil | 3:30.86 | | Djan Madruga 53.38s, Cyro Delgado 1:45.90, Romulo Arantes 2:38.41, Jorge Fernandez | | 4. Puerto Rico | 3:32.75 | | Carlos Berrocal 53.82s, Filiberto Colon 1:48.05, Fernando Canales 2:38.51, Jorge Martinez | | 5. Mexico | 3:37.34 | | Oscar Gonzalez 54.35s, Alfredo Romo 1:48.59, Cesar Sanchez 2:43.92, Richard Sasser | | 6. Venezuela | 3:42.33 | | 7. Argentina | 3:43.46 | | 8. Ecuador | 3:45.34 |
| Heats | | 1. Canada | 3:29.86 | | 2. Brazil | 3:33.60 | | 3. United States | 3:34.21 | | 4. Puerto Rico | 3:37.81 | | 5. Mexico | 3:38.25 | | 6. Venezuela | 3:43.39 | | 7. Argentina | 3:45.70 | | 8. Ecuador | 3:47.86 | | 9. US Virgin Islands | 3:49.13 | | 10.Dominicana | 3:54.77 |
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