Valve SpringSP-SeriesDual Spring/Damper435 lb/in Spring Rate1.160 in Coil Bind1.530 in ODSet of 16The �SP� series utilizes �Hi-Tensile� Chrome Silicon outer spring 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 up to 8000 rpm for 700 racing miles.
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