Manley 221448P-16 Manley NexTek Valve Springs | Atech Motorsports Energy Suspension Motor Mounts/Motor Mount Inserts The Manley 11547-8 Manley Severe

The Manley 11547-8 Manley Severe Duty Series Stainless Steel Valves are precision-machined valves for high-performance cylinder heads

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Manley 221448P-16 Manley NexTek Valve Springs | Atech Motorsports Energy Suspension Motor Mounts/Motor Mount Inserts The Manley 11547-8 Manley SevereThe 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,