Valve Spring Retainer - Upper - 911 | Boxster | Cayman | 1999-2008 964-631-912-00 Porsche It fits: 911/911S (with

Porsche It fits: 911/911S (with 3

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Valve Spring Retainer - Upper - 911 | Boxster | Cayman | 1999-2008 964-631-912-00 Porsche It fits: 911/911S (withCylinder Head Valve Spring Retainer Upper For Porsche 996 (1999 2004) 997 (2005 2008), Boxster 987 (2005 2008), Cayman 987 (2006 2008) Models. Precision engineered valve spring retainer designed for Porsche 996, 997, Boxster 987, and Cayman 987 models. This critical cylinder head component maintains proper valve spring tension and alignment, ensuring optimal engine performance and reliability. OEM quality construction withstands high RPM operation and