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In 1978 GM downsized its popular lineup of intermediate models and while still rear-wheel drive, they also had substantially less horsepower and torque than previous models owing to growing emissions and fuel economy concerns. In 1986 starting with the 305 cubic inch V-8, they increased the compression and added a hotter cam and larger diameter exhaust with the higher flow catalytic converter from the Corvette¨ to get a respectable 175 horsepower rating. With the revised 3.42:1 rear axle ratio, the 0 to 60 mph times decreased down to the low 9-second range. These mechanical improvements were wrapped in a stylish body with an all-new aerodynamic friendly nose, unique to the model.