The 4BT 3.9L Cummins is an engine in the same family as the 5,883 cc (5.9 L; 359.0 cu in) Cummins diesels. The 3.9L/4B is an inline four-cylinder naturally aspirated or turbodiesel that was popular for many step van applications, including bread vans and other commercial vehicles. Additionally it has seen broad usage in agricultural equipment. It has also gained popularity as an engine swap into smaller trucks.
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