|Source: Motor Racing Programme Covers|
In his book Forty Years of Stock Car Racing: Volume 4, Greg Fielden writes:
Petty edged past Bobby Isaac with 25 laps to go and went on to beat runner-up Bobby Allison by 2 seconds. Petty said he was comfortable running most of the race behind the foot-stomping Allison-Isaac duel. "That was a real wing-doolie of a battle." declared Petty afterwards. "Those cats were really racing - for all 400 laps. I had a ring-side seat for about 200 of 'em. I wanted to stay behind them because I figured they were likely to crash. On the last pit stop, we put on gumballs (soft-compound tires) and that probably made the difference.