Has there ever been a 8–3 in the Brasileirão?

Never.

It would be a scorigami. Based on the average number of goals in the Brasileirão, the chance of a game ending 8–3 is about 1 in 107,939.

Nearby scores

1. 9–2 1 time
2. 9–3 Never
3. 9–4 Never
4. 8–2 3 times
5. 8–3 Never
6. 8–4 Never
7. 7–2 3 times
8. 7–3 Never
9. 7–4 1 time