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The Supertech titanium valve retainer is made to suit Opel Z18 engines using a triple-groove valve stem and 5.0mm valve stem springs at standard install height. It matches the spring stem geometry and seating dimensions for that application, providing the correct retainer interface during cylinder head service where the Opel Z18 triple-groove configuration is specified.
Supertech Titanium Retainer for Opel Z18 Triple Groove 5.0mm Valve Stem Spring (STD Install Height)
