The block cylinder is the main engine structure in an internal ignition combustion engine. It constitutes is the focal structure connecting the different engine components: Pistons, conrods, crankshafts, liners, ring sets, cylinder block cover and other parts. the block cylinder is the center of the mechanical power of the engine. Genuine component parts are critical for the proper functioning of the engine. Do not use non-genuine parts while overhauling your engine. Always use genuine replacement parts.