The Cummins 5.9L rebuilt diesel engine is available at Roadmaster Engine.
The 5.9 litres (360.0 cu in) ISB (Interact System B) is one of the largest straight-six engines ever produced for light truck vehicles, and the improved high output 600 version was on the Ward's 10 Best Engines list for 2004.
One unusual feature of the ISB is that it is a multi-valve pushrod engine design. The engine displaces 5,883 cubic centimetres (359.0 cu in), with a 102.1 millimetres (4.02 in) cylinder bore and 119.9 millimetres (4.72 in) piston stroke. A turbocharger is used to increase the output in the high-compression (17.2:1 in recent versions) diesel. It is an all-iron engine with forged steel connecting rods, an assembled camshaft, and a cast aluminum intake manifold. The engine is produced in Columbus, Indiana.