1984 Ferrari 308 GTB

High performance engines like to breath. For most high-performance engines, a four valve cylinder head, two inlet and two exhaust per piston/combustion chamber, flows more air than two, one inlet and one exhaust, giving everything else. In 1982 two years after Ferrari's launch of the two-valve 308 they decided more power was better, hence the 308 QV, or quattrovalvole, four valves. Horsepower was raised to 237 from 205 for the U.S. market catalytic converter model. Clearly the new 4-valve heads made a difference especially to the North American cars; they helped to bring back power the emission equipment had taken away. Otherwise the series was little changed.