in a 620-mile Monza sports car event in April 1966. Chris Amon and Lorenzo Bandini were triumphant in a 100 lap, 1,000 kilometer Monza race in April 1967. They drove a four-litre Ferrari for an average speed of 122.30 m.p.h. Parkes and Scarfiotti finished second with a time of 5:10:59.2. The winning time was 5 hours seven minutes, 43 seconds. The Ferraris were in front after the Chaparrals of Phil Hill and Mike Spence had to make pit stops following the 17th and 18th laps. He finished second at the 1967 24 Hours of Le Mans, paired with Ludovico Scarfiotti, in a Ferrari 330P4. After the crash at the Spa Belgian GP 1967 Parkes returned to race sport cars events in 1970, with remarkable 4th place at the Daytona 24 hours on a Ferrari 312P entered by NART (paired with Sam Posey), at Sebring 12 hours he finished 6th on the same car (together with Chuck Parsons). He continued the season racing on the Filipinetti Ferrari 512S, reaching 5th place at the Targa Florio and 4th at the Nurburgring 1000 km together with Herbert Muller. Parkes competed in a 1,000 kilometer sports car race in Argentina in January 1971, he was just ahead of Ignazio Giunti's Ferrari 312PB when the Italian driver crashed on the Beltoise's Matra. He was paired with Joakim Bonnier in a five-litre Ferrari entered and owned by the Swiss Filippinetti stable which maintained operations in Modena. Parkes competed in the 1971 24 Hours of Le Mans in a modified Ferrari 512M paired with Henri Pescarolo. He was involved in the development of this car (named 512F, where "F" stands for Filipinetti, the car's owner), which proved to be very fast, winning a non-championship race at Vallelunga, Rome ahead of the Jo Siffert Porsche 917K. Parkes-Pescarolo were running well at Le Mans when a mechanical failure during the night ended their race. Parkes came back to Le Mans in 1972 with a Ferrari 365GTB entered by Filipinetti. His teammates were Lafosse and Cochet, the trio finished in seventh place, third in the GT class behind two other Ferraris.