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Why Is the 4BT Cummins So Popular for Engine Swaps? If you’re considering a diesel engine swap, chances are you’ve come across the legendary Cummins 4BT. Known for its durability, simplicity, and surprising performance, this 3.9L inline-four diesel engine has become one of the most popular engines to repower everything from off-road rigs to delivery vans—and even marine vessels. Compact but Capable Measuring just over 30 inches long and weighing 750–800 lbs, the 4BT is c …