USAC Indy Car Langhorne

Mario Andretti (right).

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Johnny Rutherford.

USAC Indy Car Langhorne

Front suspension detail.

USAC Indy Car Langhorne

Race winner Jim McElreath.

USAC Indy Car Langhorne

Close-up of an exhaust manifold.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Mario Andretti (center).

USAC Indy Car Langhorne

Car number 22, a Flynn, and car number 69.

USAC Indy Car Langhorne

Car number 58, a Russo-Nichels.

USAC Indy Car Langhorne

Car number 16, a Vollstedt.

USAC Indy Car Langhorne

Mario Andretti (second from left).

USAC Indy Car Langhorne

Billy Foster.

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti, followed by car number 52, a Moore.

USAC Indy Car Langhorne

Car number 52, a Moore, alongside car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

A.J. Foyt.

USAC Indy Car Langhorne

Leaf spring in the background.

USAC Indy Car Langhorne

Car number 52, a Moore, alongside car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Car number 12, a Hawk.

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Cars number 5 is being started as the car in the foreground drives out of the pits.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Car number 52, a Moore, leading car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Car number 52, a Moore, followed by car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Car number 57, a Gerhardt, alongside car number 41, a BRP.

USAC Indy Car Langhorne

Car number 96, an Eisert.

USAC Indy Car Langhorne

Car number 1, a Hawk.

USAC Indy Car Langhorne

Car number 1, a Lotus-Ford, driven by A.J. Foyt.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Car number 17, a Vollstedt.

USAC Indy Car Langhorne

Car number 52, a Moore, followed by car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

USAC Indy Car Langhorne

Car number 52, a Moore, followed by car 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Car number 2, a Watson, followed by car number 95, a Watson.

USAC Indy Car Langhorne

Car number 12, a Hawk, driven by Mario Andretti.

USAC Indy Car Langhorne

Gig Stephens.

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Mario Andretti.

USAC Indy Car Langhorne

Car number 29, a Gerhardt.

USAC Indy Car Langhorne

Car number 96, an Eisert, followed by car number 3, a Gerhardt.

USAC Indy Car Langhorne

Car number 4, a Watson.