Cummins B Series Engine - ISB 6.7

ISB 6.7

The B6.7 is the latest version of the B Series. It is currently the largest straight-six engine produced for a light duty truck. It produces 350 horsepower (261 kW; 355 PS) and 650 pound-feet (881 N·m) in the 2007.5 and newer Dodge 2500/3500 pickup trucks with the Chrysler-built six-speed 68RFE automatic transmission built at the Kokomo Transmission plant in Kokomo, Indiana. Engine torque is slightly reduced with the Mercedes G56 6-speed manual transmission at 350 horsepower (261 kW; 355 PS) and 610 pound-feet (827 N·m). The 2007 and newer 3500 Cab & Chassis trucks only get the 305 horsepower (227 kW; 309 PS) and 610 pound-feet (827 N·m) version of the B6.7, whether it has the Aisin AS68RC or the Mercedes G56 6-speed manual transmission. As for the 2008 4500/5500 medium duty Chassis Cabs or the Sterling Bullet Trucks, they will also receive the 305 horsepower (227 kW; 309 PS) and 610 pound-feet (827 N·m) version of the B6.7, whether it has the Aisin AS68RC or the Mercedes G56 6-speed manual transmission. Late model 2011 Ram trucks produce 350 horsepower (261 kW; 355 PS) and 800 pound-feet (1,085 N·m), with the exhaust brake rating boosted from 150 horsepower (112 kW; 152 PS) to 222 horsepower (166 kW; 225 PS).