Car and Driver 10Best tested: Ferrari Testarossa, 173 mph Top-selling cars: Imports and domestics chosen by marque, not by place of manufacture. Price cap: $35,000 Fastest car tested: 750iL "V12", 158 mph Top-selling cars: Eliminated half domestic/half import rule as impractical. Price cap: $35,000 Fastest car tested: Chevrolet Corvette "ZR-1", 175 mph Top-selling cars: New rule: No more than two places per marque. Price cap: $35,000 Fastest car tested: Chevrolet Corvette "ZR-1", 176 mph Top-selling cars: Price cap: $40,000 Fastest car tested: Ferrari F40, 197 mph Top-selling cars: Price cap: $40,000 Fastest car tested: Lamborghini Diablo, 204 mph Top-selling cars: Institution of the 2.5x
V12 engine Léon Levavasseur, building on experience gained with in-line four-cylinder engines. In 1904, the Putney Motor Works completed a new V12 marine racing engine—the first V12 engine produced for any purpose. Known as the "Craig-Dörwald" engine after Putney's founding partners, the engine mounted pairs of L-head cylinders at a 90 degree included angle on an aluminium crankcase, using the same cylinder pairs that powered the company's standard two-cylinder car. A single camshaft mounted in the central V operated the valves directly. As in many marine engines, the camshaft could be slid longitudinally to engage a second set of cams, giving valve