The McCormick 3557974M1 is a genuine OEM piston designed for agricultural machinery equipped with Perkins 1004.4, 1004.4T, 1004.40, and 1004.40T engines. This high-quality engine component features a 91.44mm bore, an overall length of 108mm, a compression height of 64.9mm, and a 31.75mm pin diameter. It ensures reliable engine performance and is suitable for various McCormick CX, MC, MTX series tractors, as well as numerous Massey Ferguson tractor and combine models.