The three C4R (racing) cars vigorously campaigned by the works team in 1952-54 brought Cunningham his greatest competition successes. All of the C4Rs were powered by a modified-for-competition Chrysler hemi-head V8 engines. Beginning with John Fitch winning the 1952 Elkhart Lake race, the blue-striped white sports roadsters were victorious at seven major races over the next two years —including the 1953 Sebring race. (Phil Walters and John Fitch driving). The fact that the three C4Rs won 74% and finished 84% of the races they entered demonstrated their durability. The Cunningham team's 3rd place overall in the 1954 race was the best C4R showing at Le Mans.