1973 cars riverside usa sports other races prototype porsche am can sportscars iroc hi res penske many a4 917 donohue mark technical 911 carrera rsr a3 engine grid chevrolet side fittipaldi rear roger brian emerson peter podium redman revson david mclaren two joy pearson charlie cook drivers front groupshot jack kemp mechanics trophy bobby fighting haywood hurley jody scheckter shadow vip airbox chimneys close cooler denny elford follmer george hulme intake manifolds sponsor up vic volkswagen allison andretti briefing fans john mario mccluskey sunoco touring women a2 angle audi cannon galerie girls helena kauhsen motiv pits portrait start tyres unser uop wide willy wings 512m a bob bottle cordts cover drink durst dutton exhaust ferrari fire flame foyt grandstand helmet hobbs interview j lola mcclusky nagel paddock peckham posey sam snapshot steve sunglasses three timekeeping tom track