The Matra 670B was one of the cars with which Matra dominated endurance racing at Le Mans from 1972 until 1975.  
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1972 Matra 670B

The aerospace company used various lightweight materials in the production of the cars such as magnesium in the tub. Each car was powered by a 3-litre V12, considered by many to be one of greatest sounding engines ever, which produced 540bhp at 12,400rpm.