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Genuine Briggs & Stratton World Formula cylinder head assembly, part # 557133 . Used, the main casting is in good appearing condition. The spark plug threads have an insert repair that is in good condition. The rockers studs show light flattening of the threads that occurred during storage, they appear to be in good usable condition but may require replacement. One of the exhaust studs is missing but the threads are in good condition.
Ships as shown including: Installed head plate, valve guides, rocker studs, pushrod guides, intake studs and one exhaust stud.