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This seal is for Gen V & Gen VI 1991 and later engines. Use with valve spring cap P/N 12550421. Technical Note: The valve guide boss must be machined slightly to provide adequate seal to retainer clearance when using a high lift camshaft or when use on Mark IV engines.
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GM (General Motors) - 12550422 - Valve Stem Seal Big Block Chevy Gen V & VI -Single Replacement
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