New and rebuilt cylinder heads are commonly available for most engines at dealerships and auto parts stores. Due to the necessity of specialized tools for disassembly and inspection, along with the potential unavailability of replacement parts, it may be more practical and economical for the home mechanic to purchase replacement heads rather than disassembling, inspecting, and reconditioning the originals. Cylinder head disassembly involves removing the intake and exhaust valves and related components, assuming that the rocker arms and camshaft(s) have already been taken out. Before removing the valves, it is important to label and store them along with their components to ensure they can be reinstalled in the same valve guides. A valve spring compressor should be used to compress the springs on the first valve, allowing for the removal of the keepers, followed by careful release of the compressor to take out the retainer, spring, and spring seat if applicable. The valve can then be pulled out of the head, and the oil seal should be removed from the guide. If the valve binds, it may be necessary to push it back into the head and deburr the area around the keeper groove. This procedure should be repeated for the remaining valves, ensuring that all parts for each valve are kept together for reinstallation. After all valves and components have been removed and organized, the head should be thoroughly cleaned and inspected, with engine disassembly completed if a full overhaul is being performed before starting the cleaning and inspection of the cylinder head.