Motorsports — Cobra, Daytona and Ford GT40
Shelby American began racing the Cobra in the fall of 1962 with driver Bill Krause entered into the three-hour endurance race at the Los Angeles Times Grand Prix on October 13. Krause ultimately did not finish, having broken an axle shaft, but the car was very competitive with the then-new Corvette Sting Ray Z06, which was also making its racing debut.[4]
Cobras dominated the SCCA United States Road Racing Championship in 1963, but the car was less successful in the FIA World Sportscar Championship. The Cobra's open-top body simply wasn't aerodynamic enough to allow the car to reach the higher top speeds its hardtop coupe competitors were capable of, particularly the Ferrari 250 GTO. For the 1964 season Shelby had Pete Brock design a new aerodynamic body for the Cobra chassis, which would make the car capable of speeds over 190 mph.[5] The new car became known as the "Daytona", named for its inaugural race at the Daytona International Speedway. Only one Daytona coupe was completed at Shelby American;[6] the other five cars prepared for the 1964 World Sportscar Championship had their bodywork completed at Carrozzeria Gransport in Modena, Italy.[7]
Driven by Dan Gurney and Bob Bondurant, the Shelby American Daytona finished first in the GT classes and fourth overall at the 1964 24 Hours of Le Mans,[8] bested only by the prototype Ferrari 275 P and 330 P. The Ford Motor Company's new prototype, the GT40, fared poorly; none of the three cars entered into the race finished. After the end of the Bahamas Speed Week in December—marking the end of the 1964 season—Ford handed control of the GT40 program to Shelby American from Carroll Shelby's old associate John Wyer (who ran the Aston Martin racing program when Shelby won Le Mans in 1959).[9]
Under Shelby's management the GT40 driven by Lloyd Ruby and Ken Miles won the first race of the 1965 season at Daytona, and Miles and Bruce McLaren finished first in the prototype class and second overall at the next race at Sebring, but otherwise the GT40 program was a disappointment overall, once again failing to finish at Le Mans. By contrast the Shelby Daytona coupe had great success for Shelby, winning the GT Division III class on the strength of class wins at Daytona, Sebring, Monza and the Nürburgring. Shelby won a title in the International Championship for GT Manufacturers in the 1965 season with the Shelby Daytona car, thus becoming the first American constructor to win a title on the international scene at the FIA World Championships.
Shelby American worked with Ford to re-engineer the GT40 for the '66 season, replacing the 289 cubic inch (4.7 L) engine with Ford's larger, more powerful 427 cu. in. (7.0 L) engine.[10] The Mk II GT40 achieved very great success, with Shelby American's wins at Daytona, Sebring and Le Mans earning Ford the International Manufacturer's Championship in 1966 and also helping Ford to enter in 24hrs of Le Mans. Shelby American cars finished first (Miles & Ruby again) and second (Gurney & Jerry Grant) at Daytona, first at Sebring (Miles & Ruby), and first (McLaren & Chris Amon) and second (Miles & Denny Hulme) at Le Mans; recalled in the 2019 film called Ford v Ferrari.[11][12] Gurney and Grant would have finished second at Sebring except their car broke down on the last lap and Gurney pushed it across the finish line, automatically disqualifying them.
During the 1966 season Shelby and Ford were already developing a more advanced version of the GT40, known early in its development as the "J-car|J-4". On August 17, 1966, only a couple months after the race at Le Mans, Ken Miles died at the wheel of a J-car while conducting high-speed testing of the car for preparing more races at Riverside.[13] The J-car was re-engineered with improved safety features and better aerodynamics, becoming the GT40 Mk IV. In 1967 the Mk IV won the only two races they entered, at Sebring and Le Mans. McLaren and Mario Andretti won the race at Sebring, while Gurney and A. J. Foyt won Le Mans, with McLaren and Mark Donohue in fourth.
After the 1967 season the FIA changed the rules governing prototypes, and the 7.0 L engine used in the Mk II and Mk IV GT40s became ineligible.[14] Ford wound up the Ford Advanced Vehicles group and Shelby American withdrew from the World Sportscar Championship, transferring control back to John Wyer's J.W. Automotive Engineering (JWA).[15] JWA GT40s won the 1968 and 1969 races at Le Mans, giving the GT40 program an unprecedented four consecutive wins (matched only by the Porsche 956 in the 1980s).[16]