Valve spring performance is very important for valves to follow accurate cam profile._x000D_
_x000D_
1. Compatible with High RPM Engines_x000D_
_x000D_
As engine rpm rises, valves must open and close in a shorter time and so requires stronger Valve Springs in order to apply sufficient pressure._x000D_
_x000D_
2. Ensuring Close-Contact_x000D_
_x000D_
When changing to high lift cams, proper contact between the valves and the cams can be lost which leads to valve float. HKS Valve spring use the highest quality materials, heat treatment and shot-peening to create a high durability spring with low inertia.