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As the Piston assembly is constantly slamming against the Cylinder Head during a gearbox cycle, the Cylinder Head endures a lot of stress. Plastic Cylinder Heads tend to crack and fail over time due to these stressors. Unlike stock plastic Cylinder Heads, this unit is built from high-grade aluminum and can withstand the strongest of springs. Due to the dual O-ring design, this Cylinder Head makes an excellent seal.