400 m, Men
| Competition | 1977 South American Athletics Championships |
|---|---|
| Venue |
Montevideo
 URU
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Delmo da Silva |  BRA |
47.7 | ||
| 🥈 | Ariel Santolaya |  CHI |
47.71 | ||
| 🥉 | Djalma Pereira de Oliveira | BRA |
48.24 |