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Caterpillar’s Cat CT660 Class 8 vocational trucks are designed to work as transit mixers, refuse haulers, dump trucks and in any application requiring a heavy-duty truck. Engine options for the CT660 include the Cat CT11, CT13 and CT15—with displacements of 11.1, 12.5 and 15.2 liters—provide horsepower ratings from 330 to 550 and peak torque ratings from 1,450 to 1,850 lb-ft. The engines are designed specifically for vocational applications, yielding optimum horsepower/torque combinations, while providing customers the flexibility to match power and performance to specific applications and operating conditions. The engines combine an advanced exhaust-gas-recirculation system with a high-pressure common-rail fuel system, precision intake-air management system and electronic controls to provide an optimum blend of high performance, low emissions and superior fuel economy.