"SP" Series Dual Valve Springs with Damper (16) 1.530" OD ISK8005SP Product:150LBS @ 1.875" Seat Pressure, 435LBS @ 1.225" Open Pressure, 1.160" Bulkhead AN Nut

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"SP" Series Dual Valve Springs with Damper (16) 1.530" OD ISK8005SP Product:150LBS @ 1.875" Seat Pressure, 435LBS @ 1.225" Open Pressure, 1.160" Bulkhead AN Nut"SP" Series Dual Valve Springs with Damper (16) 1. 530" OD 150LBS @ 1. 875" Seat Pressure, 435LBS @ 1. 225" Open Pressure, 1. 160" Coil Bind ISK8005SP K8005SP The "SP" series utilises "Hi Tensile" Chrome Silicon outer material. For applications with radical cams and or moderately high rpm, where traditional chrome silicon springs prove inadequate, the "SP" series is the next highest level of endurance. All "SP" series springs are Spintron Test Proven