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Manley 221448P-16 Manley NexTek Valve Springs | Atech Motorsports Cold Air Intakes Order Hypertech 11051 Hypertech StreetThe Manley 221448P 16 Manley NexTek Valve Springs Atech Motorsports provide the required spring pressure for aggressive cam profiles without coil bind or surge at high RPM. Manley Professional valve springs are wound from proprietary wire stock and heat set to prevent pressure loss over time. Part 33474 is configured for its specific application with attention to fitment requirements. Each spring is tested for installed height pressure, open pressure,