Overview Reviews Similar Products –> Product Description Note: Generac 10000039224 head assembly. This is part 48 in the image. Loss of engine power, overheating, or a drop in compression often points to trouble at the top end of your generators engine. The Generac 389cc Cylinder Head Assembly delivers a complete replacement head that restores proper sealing and combustion chamber conditions. A well-built cylinder head assembly helps your engine run more smoothly and sustain reliable performance under load. The cylinder head sits on the engine block and houses vital components such as valves, ports, and spark plug openings. It also seals the top of each cylinder, so air and fuel are compressed effectively before ignition. Over time, warping, cracks, or gasket failures can allow compression to relax or cause coolant and oil to mix, leading to rough running and reduced efficiency. This assembly replaces those worn components so your engine can perfor
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