The Honda S600 is an automobile manufactured by Honda. It was launched in March 1964. It was the first Honda car to be offered in two versions: as a roadster – bearing strong resemblance to the Honda S500 – and as a fastback coupé (called SM600), introduced in March 1965. During its production run up to 1966, the model styling would remain pretty much the same, with the most notable changes coming to the front grille, bumper, and headlights.
Honda S600 (rear) at the Petersen Automotive Museum
Powered by a DOHC, water-cooled, four-cylinder inline engine with four carburetors, the engine capacity was increased to 606 cc from the S500's 531 cc. The engine produced 57 hp (43 kW) at 8,500 rpm and had a top speed of 90 mph (140 km/h). With the convertible weighing in at mere 1,576 lb (715 kg), the extra sheet metal of the coupe only added 33 lb (15 kg) to the overall weight. Suspension was independent with sealed roller chain drive to each rear wheel.
Source: Wikipedia, 2011