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Cam manufacturers offer valvespring recommendations for almost all grinds and cylinder heads. The two springs on the right are single-wire valvesprings, but they differ in height. The two springs on the right are dual valvesprings with a ribbon spring that acts as a dampener. To find the total spring rate of a dual spring, add the rates of both the inner and outer. Don't forget to also install a valve seal and measure the distance from the bottom of the retainer to the top of the seal. There should be at least 0.050 inch extra clearance compared to the total valve lift. View Related Article
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