The McCormick 378241X1 Piston Ring is a crucial engine component designed for various International Harvester and McCormick tractor models. This genuine replacement part ensures optimal engine compression and effective oil control within the cylinders, which is vital for maintaining engine efficiency, power, and longevity. It is compatible with a broad range of models, including the B250, B275, B414, 434, 444, 354, 364, 384, 276, 3434, 3444, 3544, 454, 464, 484, 574, 584, 674, 684, 784, 884, 2400, 2500, 3400, 3500, 3600, 3800, 4000, 4500, 5000, 6000, 7000, and 8000 series.