LeBron James had 32 points and 10 rebounds, Chris Bosh added 25 points and the Heat grabbed control of the East finals by topping the Indiana Pacers 102-90 in Game 4 for a 3-1 lead.
Dwyane Wade added 15 points and Miami never trailed, leading by 23 at one point.
Only the Celtics and Lakers franchises have been to the NBA Finals in four straight seasons. The Heat now have three chances to join that club, starting with Game 5 at Indiana on Wednesday night.
Paul George scored 23 points and David West added 20 points and 12 rebounds for the Pacers, who got 15 points from George Hill. But Lance Stephenson was held to nine and 7-foot-2 center Roy Hibbert was scoreless in 22 minutes for Indiana.