The Argo JM19 was the consummate chassis-for-hire of the 1980s prototype scene, a brilliantly adaptable platform that attracted a wild variety of engine partners. But for pure endurance pedigree, nothing could top the 1987 Argo JM19 Porsche. This submodel represented a privateer’s dream: combining the proven, lightweight British Argo monocoque with the most dominant engine in sports car racing history.

This variant, campaigned by privateer outfits like Dahm Cars Racing for the 24 Hours of Le Mans, ditched the high-strung rotaries and fragile, small-capacity turbos. In their place, it adopted a version of Porsche’s legendary air-cooled, turbocharged flat-six. This was the bulletproof heart of the dominant 956 and 962, an engine forged in the fires of La Sarthe and Daytona.

While it was often a 3.2-liter, twin-turbo setup, its true strength wasn’t just raw power—it was reliability. This was the engine that finished races. The mechanical symphony was pure Stuttgart: a deep, throaty, air-cooled thrum overlaid with the menacing whine of turbochargers. For the privateer teams taking on the grueling 24-hour classics, the JM19-Porsche was the smart choice, a blend of British agility and German stamina built to go the distance.