With 20 laps to go, Johncock still led Foyt by 10 seconds.
Sneva was lurking in third place.
With Johncock physically ailing, A. J. Foyt began to close the margin.
Johncock made his final stop on lap 181.
He took on fuel only, and the crew again doused him with water.
He pulled away after a 14.7 second stop.
Two laps later, Foyt made his final stop.
Foyt took on right side tires and fuel, and was away in only 12.9 seconds.
Johncock re-assumed the lead, but it was down to only 7 seconds.

Suddenly as Johncock hit the mainstretch the next time around to complete lap 184, a huge cloud of smoke came from his car and he veered to the inside.
Johncock parked the car in turn one with a broken crankshaft.
Foyt inherited the lead with only 16 laps to go.
Johncock climbed from his car, and hopped into the infield creek to splash some water on himself to cool off.

Foyt now held a nearly 30-second lead over second place Tom Sneva.
Foyt was able to cruise comfortably over the final 15 laps and became the first driver to win the Indianapolis 500 four times.
With 20 laps to go, Johncock still led Foyt by 10 seconds. Sneva was lurking in third place. With Johncock physically ailing, A. J. Foyt began to close the margin. Johncock made his final stop on lap 181. He took on fuel only, and the crew again doused him with water. He pulled away after a 14.7 second stop. Two laps later, Foyt made his final stop. Foyt took on right side tires and fuel, and was away in only 12.9 seconds. Johncock re-assumed the lead, but it was down to only 7 seconds.
Suddenly as Johncock hit the mainstretch the next time around to complete lap 184, a huge cloud of smoke came from his car and he veered to the inside. Johncock parked the car in turn one with a broken crankshaft. Foyt inherited the lead with only 16 laps to go. Johncock climbed from his car, and hopped into the infield creek to splash some water on himself to cool off.
Foyt now held a nearly 30-second lead over second place Tom Sneva. Foyt was able to cruise comfortably over the final 15 laps and became the first driver to win the Indianapolis 500 four times.
1977 Indianapolis 500