A sporty derivative, the VX4/90, announced separately in mid-October 1961[15] was also available. It was fitted with a twin-carburettor, a taller alloy head, high-compression expansion controlled pistons, and a nitrided EN19B steel crankshaft engine giving 71 bhp (53 kW; 72 PS) and servo-assisted disc brakes (same as Cresta brakes) on the front wheels. Externally the car was distinguished from the standard car by a coloured stripe down the side, revised grille and larger tail-light clusters. These cosmetic features were essentially similar to the Canadian-market-only Envoy models. The VX4/90 was available only in saloon form with 4-speed (GM Opel) all-synchro gearbox, Lockheed front disc brakes, 14 inch wheels, front individual / bucket seats, full instrumentation including mechanically driven (from the distributor) tachometer and heater. The VX4/90 FBX engine also was upgraded to the 31FB, the larger bore size giving 1595 cc (97 cubic inches). With a change in rear axle ratio from 4.125 to 3.9, the VX 4/90 could now easily exceed 90 mph.
