Has a World Cup game ever ended 8-3?
Yes. World Cup has seen a final score of 8-3 2 times. It first happened on June 20, 1954, when Hungary beat Germany, and most recently on June 5, 1957, when Belgium beat Iceland.
That makes 8-3 the 38th most common final score out of 53 that have ever occurred in World Cup. One point away, 9-3 has happened 1 times and 8-4 has happened never.