GM 12550909 Valve, Exhaust

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Due to the intricate nature of the task and the specific tools and equipment required, the servicing of valves, valve seats, and valve guides, often referred to as a valve job, is best handled by a professional. A home mechanic can take apart and reassemble the heads, perform the initial cleaning and inspection, and then deliver the heads to a dealer service department or an automotive machine shop for the actual valve servicing. The dealer service department or automotive machine shop will then remove the valves and springs, recondition or replace the valves and valve seats, recondition the valve guides, check and replace the valve springs, spring retainers or rotators and keepers as needed, replace the valve seals with new ones, reassemble the valve components and ensure the installed spring height is correct. The cylinder head gasket surface will also be resurfaced if it's warped. Once the valve job has been completed by a professional, the head will be in a condition similar to new. When the head is returned, it should be cleaned again before installation on the engine to remove any remaining metal particles and abrasive grit from the valve service or head resurfacing operations. Compressed air should be used, if available, to blow out all the oil holes and passages.