The mileage on your odometer is nearing the same number as a population of people living in a large city, so you decide it is time to swap out the standard engine in your truck and go all in with something that rumbles with raw power. Pop out the old thing and lower in a Cummins 4BT engine for that added oomph. The Cummins 4BT is a four-cylinder, B-series turbo diesel. Its compact size makes it an ideal aftermarket engine option because it fits into smaller vehicles than originally intended. Its original purpose is to move small commercial vehicles, vans, and boats and operate farming equipment, so you can imagine how much the 4BT engine propels a smaller truck. While it increases power, the Cummins 4BT also improves your truck's performance. The mechanical injection system and limited wiring makes this an ideal choice as a replacement engine, especially for an at-home build or quick project. The trustworthy sellers on eBay offer plenty of Cummins 4BT diesel engines with a variety of injection-pump system options. Make the swap from the comfort of your own garage for a fun and relatively simple upgrade project so you can hop in, turn the key, and roar down the driveway.Shop the large inventory of motors, parts, accessories, and complete Cummins car and truck engines!