400 m, Men
| Competition | 1966 South American Athletics U20 Championships |
|---|---|
| Venue |
Montevideo
 URU
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Jaime Núñez |  CHI |
49.9 | ||
| 🥈 | Celso Wolf |  BRA |
50.1 | ||
| 🥉 | Carlos Schopf | URU |
50.3 |