This beehive spring and chromoly retainer kit is designed for the late model dual spark plug heads with the smaller 7mm valve stems. This spring and retainer package yields an increased 117lb closed seat pressure and 225lb open pressure making it ideal for performance hydraulic roller cam upgrades in your late dual plug head. This kit allows up to .550" lift and works with the stock valves, keepers and head- no machining required. Use this kit with our Stage 1.1 or 1.5 ranger cam. Price includes (8) valve springs and (8) retainers