The Case-IH 378336R91 is a genuine OEM engine block designed for various Case-IH and International Harvester agricultural and construction equipment. This critical component ensures the structural integrity and proper functioning of the engine, supporting cylinders and other vital internal parts. Built to OEM specifications, it offers durability and precise fitment across numerous tractor, combine, cotton picker, and windrower models, ensuring reliable performance and longevity for your machinery.