Cylinders in each V-pair are directly opposite each other, and since all rods are always in compression, the connecting rods use a simple system of "fork" rods on one bank of cylinders and "blade" rods on the other (with the same stroke on both banks). As all rods are alternately in compression or tension throughout all four engine cycles, competitor General Electric in its 7FDL engine series uses "articulated" master-slave connecting rods (with a slightly longer stroke on the bank with articulated rods). The engines are provided with either a single or twin Roots blower, or a single mechanically-assisted turbocharger, depending on required power output.