Replacing the original, locked up six cylinder his ’41 Chevy school bus came with, Jason Bliesner had plans to install a 5.9L Cummins from the outset of his rat-rod project. After scoring this P-pumped 6BT out of a Ford school bus, it was torn down so that he could prep it for higher horsepower in addition to starting fresh. Quality Engine Machine Shop (of Litchfield, Illinois), Scheid Diesel, and DeClerck Custom Machine all had a hand in the build, with local truck puller, Drew DeClerck, handling its assembly. While piecing things together, upgrades like ARP main and head studs, a Hamilton 188/220 street cam and tappets, fire-rings, and 180-lb valve springs all made the cut.