| Final 20:40 | Team | time | L | Q | React. | Birth | | 1. Leford Green | JAM | 48.47s | 5 | 4. | 0.354 | 14 Nov 1986 | | 2. Javier Culson | PUR | 48.58s | 6 | 1. | 0.185 | 25 Jul 1984 | | 3. Roxroy Cato | JAM | 49.62s | 3 | 3. | 0.236 | 1 May 1988 | | 4. Felix Sanchez | DOM | 50.08s | 4 | 2. | 0.233 | 30 Aug 1977 | | 5. Kenneth Medwood | BIZ | 51.08s | 1 | 8. | 0.187 | 14 Dec 1987 | | 6. Jonathan Gibson | PAN | 51.36s | 2 | 7. | 0.193 | 5 Jul 1982 | | 7. Winder Cuevas | DOM | 51.49s | 7 | 6. | 0.345 | 1 Aug 1988 | | -. Alie Beauvais | HAI | DNF | 8 | 5. | | 5 Jan 1988 |
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| Heats. Monday 26.07 19:20. First 3 and Best 2 progress. |
| Heat 1 19:20 | Team | time | L | Rk. | Birth | | 1. Felix Sanchez | DOM | 50.19s | 6 | 2. | 30 Aug 1977 | | 2. Roxroy Cato | JAM | 50.27s | 8 | 3. | 1 May 1988 | | 3. Alie Beauvais | HAI | 51.12s | 1 | 5. | 5 Jan 1988 | | 4. Jonathan Gibson | PAN | 51.49s | 2 | 7. | 5 Jul 1982 | | 5. Jonathan Williams | BIZ | 52.55s | 4 | 10. | 29 Aug 1983 | | 6. Allan Ayala | GUA | 53.57s | 7 | 12. | 7 Jul 1986 | | 7. Emmanuel Mayers | TRI | 55.38s | 3 | 13. | 9 Mar 1989 | | -. Jamele Mason | PUR | DNF | 5 | | 19 Oct 1989 |
| Heat 2 19:25 | Team | time | L | Rk. | Birth | | 1. Javier Culson | PUR | 49.89s | 4 | 1. | 25 Jul 1984 | | 2. Leford Green | JAM | 50.67s | 6 | 4. | 14 Nov 1986 | | 3. Winder Cuevas | DOM | 51.18s | 8 | 6. | 1 Aug 1988 | | 4. Kenneth Medwood | BIZ | 51.70s | 7 | 8. | 14 Dec 1987 | | 5. Junior Hines | CAY | 52.24s | 5 | 9. | 25 Jan 1989 | | 6. Lurias Eugene | HAI | 52.61s | 2 | 11. | | | -. Leslie Murray III | ISV | DNS | 3 | | 24 Jan 1991 |
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