<P> The 5.9 liters ( 360.0 cu in ) 6BT , aka the Cummins `` 12 - valve '' was the first member of the `` B '' engine family to be used in a light truck vehicle . The 6BT used Robert Bosch GmbH fuel systems , injector , and VE rotary pump and P7100 inline injection pumps . Some early 6BTs were supplied with CAV rotary pumps instead , before the Bosch system became the sole standard . This engine started life in 1984 designed as an agricultural engine , for use in Case agricultural equipment . After 1989 , the 6BT engine was used in light duty , medium duty and select heavy duty trucks and buses . </P>
<P> The 5.9 liters ( 360.0 cu in ) 6BT , aka the Cummins `` 12 - valve '' was the first member of the `` B '' engine family to be used in a light truck vehicle . The 6BT used Robert Bosch GmbH fuel systems , injector , and VE rotary pump and P7100 inline injection pumps . Some early 6BTs were supplied with CAV rotary pumps instead , before the Bosch system became the sole standard . This engine started life in 1984 designed as an agricultural engine , for use in Case agricultural equipment . After 1989 , the 6BT engine was used in light duty , medium duty and select heavy duty trucks and buses . </P>
when did the 12 valve cummins come out
when did the 12 valve cummins come out
1984
1984