An era of front-engined roadsters in Indy 500 actually ended in 1964, when A.J. Foyt took the last victory for old classic monsters. Even in 1964 the majority of the field (21 of 33 starters) were new rear-engined cars. In 1965 they earn 27 out of 33 starting spots, and in 1966 only one front-engined roadster were present in the starting grid. The rear-engined revolution was inspirited by European racing car constructors, who introduced this type of the racing car design in Formula 1 in 1959. All American Racers, founded by Dan Gurney and Carroll Shelby in 1964, was one of the conductors of European racing car design ideas in North America, building the cars simultaneously for F1 and for Indy. In the 1966 Indianapolis 500 starting field six AAR Eagle cars were present. One of them was driven by Lloyd Ruby, an American racecar driver who raced in the USAC Championship Car series for 20 years (1958 – 1977) achieving 7 victories. He also raced in the 1961 United States Grand Prix driving private Lotus – Climax. In the 1966 Indy-500 Ruby in Bardahl-sponsored Eagle Mk2 dueled with Jim Clark for the lead and led most laps in the race (68), but stopped after 166 laps due to broken cam stud, being classified 11th.
|1966||USAC National Championship||Indianapolis 500|
|Lloyd Ruby||14||All American Racers|
|Eagle Mk2||Ford||Bardahl Eagle|