400 m, Men
| Competition | 1948 South American Athletics Championships |
|---|---|
| Venue |
La Paz
 BOL
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Eduardo Laca |  PER |
50.5 | ||
| 🥈 | Reinaldo Müller |  CHI |
50.9 | ||
| 🥉 | Sergio Guzmán | CHI |
51.0 |
| Competition | 1948 South American Athletics Championships |
|---|---|
| Venue |
La Paz
BOL
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Eduardo Laca | PER |
50.5 | ||
| 🥈 | Reinaldo Müller | CHI |
50.9 | ||
| 🥉 | Sergio Guzmán | CHI |
51.0 |