Both QV models can also be identified by a revised radiator grille and bumper, an air outlet louvre in the front lid and new door mirrors featuring a small enamel shield on the casing. The 308 GTS Quattrovalvole, with a removable targa roof, succeeded the 308 GTSi, and was presented at the 1982 Paris Salon concurrently with the 308 GTB Quattrovalvole model. The Quattrovalvole part of the model name referred to the four valves per cylinder heads on the engine, which provided increased power over the preceding model.
The V8 engine was essentially of the same design as that used in the 308 GTSi model, apart from the four valves per cylinder heads. It was of a 90 degree configuration, with belt driven twin overhead camshafts per bank, having a total capacity of 2926cc, with a bore and stroke of 81mm x 71mm, with wet sump lubrication, bearing factory type reference F 105 AB 000 for European market cars.
The claimed power output for main market European cars was 240bhp at 7000rpm, and 235bhp at 6800rpm for US market variants. The engine was transversely mounted in unit with the all synchromesh five speed transmission assembly, which was below, and to the rear of the engine’s sump.
The gear and final drive ratios were altered to suit the revised characteristics of the four valves per cylinder engine. It was fitted with a Bosch K Jetronic fuel injection system, coupled to a Marelli MED 803A Digiplex electronic ignition system, incorporating a coil, distributor and ignition module to serve each bank of cylinders. All US market examples were fitted with catalytic convertors.