One unusual feature of the ISB is that it is a multi-valve pushrod engine design, with 4 valves per cylinder (it is thus sometimes called the "24-valve" Cummins). The engine displaces , with a cylinder bore and 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.