Valve jobs are difficult because of how complicated valve components are and what kind of tools and tools you need. Let professionals handle it, since you won't have their experience and special tools. When your car needs valve work, the home mechanic can first unmount and take apart the engine head, clean it as needed, double-check everything, put it back together, and transport it to where professional mechanics can finish the job. Checking the parts makes it simple for you to tell what work and components will be needed when you need professional automotive machine shop repairs. The dealer service or auto machine shop team takes off the valves and springs; fixes or replaces the valve components and seats; repairs and replaces guide mechanisms; verifies and readjusts valve springs, retainers, and keepers; installs fresh valve seals; places all valves back in order; and ensures the valve spring level is precise. At the same time, if the cylinder head gasket surface is not level, they'll adjust it during the process. When working on a Legend car, have both cylinder heads resurfaced if they aren't perfectly flat. Also, workers should revamp the interaction points between the intake manifold and the cylinder head system to accommodate the new head positions. When an experienced professional completes the valve work, the head will have the condition it had when it was brand new. Before putting the head back on the engine, clean it one more time to remove any leftover metal particles or rough bits left over from valve work or the head resurfacing process. Blow clean oil holes and passages using air when you have it.