Has there ever been a 8–4 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 8–4 is about 1 in 414,845.

Nearby scores

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