The Case-IH 2991778 is a genuine OEM connecting rod bearing set, specifically designed with a 0.25mm undersize for crankshaft journals that have been machined. This critical engine component ensures proper fit and function in FPT NEF 4.5L and 6.7L engines. It is compatible with a wide range of Case IH agricultural equipment, including Puma, Maxxum, and Magnum series tractors, as well as various New Holland T6, T7, and T8 series models. This bearing set is essential for engine rebuilds and maintenance, providing reliable performance and extending engine life.