The four-round series has been devised by Roger Penske to pitch 12 of the world’s finest racing drivers against each other in identical Porsche 911 Carrera 3.0 RSRs, for a share of 175,000 US dollars – a quite extraordinary sum. Over 65,000 people have descended on the Californian circuit to see title-winners from various disciplines including Denis Hulme, Bobby Unser, Richard Petty and Mark Donohue duke it out. Helena Fittipaldi can’t smell the prize-money just yet, however – having retired in the first race of the day, Emerson is keen to win the second. Alas, third position is all he will muster, in spite of his emphatic display. 

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