[3][6] The T600's carbon-fibre reinforced aluminium honeycomb structure monocoque was retained in the T616, and the engine acted as a semi-stressed member along with two tubular frames mounted across the cockpit.

[7] The suspension was constructed in such a way that the springs and Bilstein gas dampers were situated on top the crossbeam, meaning that the flow of the air through the underbody Venturi tunnels was largely undisturbed.

[8] The initial prototype, built in 1979, was based on Ford's LL23 inline-four, and much of the timing structure along with the connecting rods were injection moulded from Torlon.

By 1982, Holtzberg's Polimotor had further enhancements such as dual overhead camshafts, which meant that the engine produced 300 hp (224 kW; 304 PS) and weighed 69 kg (152 lb).

[9] Holtzberg campaigned his Polimotor-powered T616 in the 1984 and 1985 seasons of the IMSA GT Championship, with his sole engine-related retirement coming as a result of a metal connecting rod failure.

68 driven by Pete Halsmer, Dieter Quester, Ron Grable and Rick Knoop placed 11th in the GTP class (17th overall), and the sister No.

67 of Jim Busby, Rick Knoop and Boy Hayje didn't make it to the flag, having stopped on lap 391 with a blown engine, and was classified 31st overall.

[12] The two cars were then flown over to Europe to compete in the season-opener of the 1984 World Sportscar Championship, the 1984 1000 km of Monza, where they posted their best finish of the season with the No.