It was now around 4 p.m. when the NART Ferrari of Sam Posey and Ronnie Bucknum blew a tire at speed while passing the pits. The tire was soon shredded and the car was running on the rim but the rim didn’t last long and before the car could get to the pits a hole was worn into the engine oil sump and it began to dump oil. Oil on the track flags began waving at turns 10, 11 and 12 as the car left a black streak on the pavement. It retired after completing 114 laps.
At 6 p.m. they were at the half-way point and when the standings were posted many were surprised to see the 3-liter Alfa Romeo T33/3 of Nanni Galli and Rolf Stommelen in the lead. The faster Elford-Larrousse Martini 917 was in second only because they had to pit due to a brake piston seizure. The Rodriguez/Oliver 917 was third, the Alfa of Adamich, Pescarolo, Vaccarella was fourth and the Siffert/Bell 917 was fifth. The Donohue-Hobbs Ferrari was in eighth with the Greenwood-Smothers Corvette now in the top ten at 9th spot.