Cosworth DFV
For 1971, Ligier had the JS1 developed into the JS2 and JS3. The JS2 was homologated for road use and used a Maserati V6 engine, while the JS3 was an open-top sports-prototype powered by a Cosworth DFV V8 engine. The JS3 won at Monthlery in 1971 but failed to finish the minimum distance in Le Mans. Therefore, it was retired, and Ligier installed the Cosworth DFV in the JS2 road car, finishing second overall at Le Mans in 1975. Guy Ligier then switched his efforts into Formula One.