monobloc straight-4. This multi-valve straight-6 offered 180-200 bhp (0.45-0.50 bhp per cubic inch). The 1930 Bentley 8 Litre multi-valve straight-6 produced appr. 220 bhp (0.45 bhp per cubic inch). In 1931 the Stutz Motor Company introduced a 322 cid (5.3-liter) dual camshaft 32-valve straight-8 with 156 bhp (116 kW) at 3900 rpm, called DV-32. The engine offered 0.48 bhp per cubic inch. About 100 of these multi-valve engines were built. Stutz also used them in their top-of-the-line sportscar, the DV-32 Super Bearcat that could reach 100 mph (160 km/h). The 1935 Duesenberg SJ Mormon Meteor's engine was a 419.6 cid (6.9-liter) straight-8 with DOHC, 4 valves per cylinder and a supercharger. It achieved 400 bhp (298.3 kW) at 5,000 rpm and 0.95 bhp per cubic inch. The 1937 Mercedes-Benz W125 racing car used a supercharged 5.7-liter straight-8 with DOHC and four valves per cylinder. The engine produced 592-646 bhp (441.5-475 kW) at 5800 rpm and achieved 1.71-1.87 bhp per cubic inch (77.8-85.1 kW/liter). The W125 top speed was appr. 200 mph (322 km/h). After 1945 The 1967 Cosworth DFV F1 engine, a NA 3.0-liter V8 producing appr. at 9,000 rpm (101.9 kW/liter), featured four valves per cylinder. For many years it was the dominant engine in Formula One, and it was also used in other categories, including CART, Formula 3000 and Sportscar racing. Debuting at the 1968 Japanese Grand Prix in the original 3.0-liter version the Toyota 7 engine participated in endurance races as a 5.0-liter (4,968 cc) non-turbo V8 with DOHC and 32-valves. It produced at 8,000 rpm (88.8 kW/liter) and at 6,400 rpm. There is much discussion about which was the first 'mass-produced' car to use an engine with four valves per cylinder. For six cylinder engines, and considering special versions of mass-produced cars, the first appears to have been the 1969 Nissan Skyline, using the Nissan S20 six cylinder DOHC four-valve engine. This engine was also fitted to Nissan Fairlady Z432 racing edition. For a four cylinder engine, the first mass-produced car using a four valves per cylinder engine was the British Ford Escort RS1600, this car used the Cosworth BDA engine which was a Ford 'Kent' block with a Cosworth 16 valve twin cam cylinder head. The car went on to become a rallying legend in the 1970s winning many domestic and World Championship events. Other cars claiming to be first are the Jensen Healey, launched