Cale Yarborough and Donnie Allison crashed in a battle for the lead .
They were wrestling in the Turn 3 grass , along with Allison 's brother , Bobby , as Richard Petty drove to victory lane for the sixth time .
Cale Yarborough and Donnie Allison crashed in a battle for the lead , and they were wrestling in the Turn 3 grass , along with Allison 's brother , Bobby , as Richard Petty drove to victory lane for the sixth time .