HKS valve springs are the performance versions specifically designed to be used
with HKS camshafts. As valve train dynamics change from the use of high
performance cam profiles and with greater lift, stiffer springs are often needed
to optimize valve movement. When changing to a high lift cam, the stock springs
often can not match the increased valve train movement, therefore HKS has specifically engineered valve springs that match the characteristics of HKS camshafts. A stringent shot peening and heat treatment process is applied to the
HKS valve springs to provide durability and consistency in the spring rates over time. Applications with high revving engines will especially benefit from the use of HKS valve springs, as the risk of valve-float is greatly reduced due to their specific
design and construction.
 

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