<P> The B Series is known for the popular 5.9 liters (360.0 cu in) B Series Cummins engines . The engine was originally designed by Cummins and Case Corporation for construction machinery applications, and gained much of its popularity after appearing in the Dodge Ram, in 1989 . </P> <P> The B - series features engine bores machined directly into the block (rather than the wet liners used on earlier Cummins engines). It was also set apart by the use of a shallow one - piece head, requiring closer tolerances than in other Cummins products . The engine was first manufactured in Rocky Mount, North Carolina, and other plants were later added in Mexico, Turkey, and Darlington, UK . </P> <P> Every Cummins powered Dodge Pickup (since initial production in 1989) has come equipped with a turbocharger . It uses a gear - drive camshaft for extra reliability . Also specified is a deep - skirt engine block and extra-strong connecting rods . A Holset turbocharger is used . The original B Series was updated with 24 valves and an electronic engine management system to become the ISB in 1998 . </P> <Table> <Tr> <Th_colspan="2"> Cummins B Series </Th> </Tr> <Tr> <Th_colspan="2"> Overview </Th> </Tr> <Tr> <Th> Manufacturer </Th> <Td> Cummins </Td> </Tr> <Tr> <Th> Also called </Th> <Td> 4B / 6B / 6BT / 6BTA </Td> </Tr> <Tr> <Th> Production </Th> <Td> 1984--1998 </Td> </Tr> <Tr> <Th_colspan="2"> Layout </Th> </Tr> <Tr> <Th> Configuration </Th> <Td> I4 and I6 diesel engines </Td> </Tr> <Tr> <Th> Displacement </Th> <Td> <Ul> <Li> 3.3 liter </Li> <Li> 3.9 liter </Li> <Li> 5.9 liter </Li> </Ul> </Td> </Tr> <Tr> <Th> Cylinder block alloy </Th> <Td> Iron </Td> </Tr> <Tr> <Th> Cylinder head alloy </Th> <Td> Iron </Td> </Tr> <Tr> <Th> Valvetrain </Th> <Td> 2 Valves per cylinder </Td> </Tr> <Tr> <Th_colspan="2"> Combustion </Th> </Tr> <Tr> <Th> Turbocharger </Th> <Td> Holset Engineering </Td> </Tr> <Tr> <Th> Fuel system </Th> <Td> Direct injection </Td> </Tr> <Tr> <Th> Management </Th> <Td> Mechanical </Td> </Tr> <Tr> <Th> Fuel type </Th> <Td> Diesel </Td> </Tr> <Tr> <Th> Oil system </Th> <Td> Wet sump </Td> </Tr> <Tr> <Th> Cooling system </Th> <Td> Water - cooled </Td> </Tr> <Tr> <Th_colspan="2"> Dimensions </Th> </Tr> <Tr> <Th> Dry weight </Th> <Td> 1,100 lb (499 kg) </Td> </Tr> </Table>

When did the 24 valve cummins come out