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Hold 450 ft-lbs with a pedal feel you can live with
the Sierra Marine 18-9915 eliminates guesswork and reduces diagnostic time
introducing unwanted suspension movement that degrades handling precision
No cutting or fabrication required
The lobe separation angle is optimized for your specific application
Manley 221448P-16 Manley NexTek Valve Springs | Atech Motorsports Energy Suspension Motor Mounts/Motor Mount Inserts Hold 450 ft-lbs with aThe 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,
