4 x 400 m Relay, Men
| Competition | 1978 South American Athletics U18 Championships |
|---|---|
| Venue |
Montevideo
 URU
|
| Held | — |
| Status | Medal |
| Competitors | 12 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Brazil |  BRA |
3:25.0 | ||
| Ricardo De Oliveira | — | ||||
| Sidney Dos Santos | — | ||||
| Pedro Souza | — | ||||
| Joaquim Cruz | — | ||||
| 🥈 | Chile |  CHI |
3:27.4 | ||
| Gerardo San José | — | ||||
| Marcelo Bancalari | — | ||||
| Sergio Cárdenas | — | ||||
| Guillermo Puebla | — | ||||
| 🥉 | Venezuela |  VEN |
3:30.1 | ||
| Douglas Murillo | — | ||||
| Oswaldo Zea | — | ||||
| Chaparro | — | ||||
| Ramírez | — |