(2.61l) version and equipped with a Garrett turbocharger limited to 24.6 psi (1.7 bar) delivered over 700 hp.

Following a trend set by the previous year Lotus 72, the radiators were moved to the sidepods giving the car a wedge shape.

The three cars made the qualified in the top 4, but only Revson manages to finish the race in second place.

For that year Indy 500 Gordon Johncock replaced Denny Hulme and Penske entered a second car for Gary Bettenhausen.

Although none of those three crossed the finish line, Mark Donohue did so in the first place, making the car the first McLaren to win the famous race and also giving Penske their first of a long list of victories at Indy.