400 m, Men
| Competition | 1964 South American Athletics U20 Championships |
|---|---|
| Venue |
Santiago
 CHI
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Andrés Calonge |  ARG |
48.7 | ||
| 🥈 | José Jacinto Hidalgo |  VEN |
48.9 | ||
| 🥉 | Adjalme De Carvalho |  BRA |
49.1 |