KVS220-X | EJ20 / EJ25 Extreme

Designed for extreme boost and high RPM racing. Made from ultra clean Silicon Chrome spring steel with a higher fatigue resistance compared to other spring steels. Heat treating and post processing is the highest quality available. High frequency spring design to reduce spring surge at high operating RPM. This kit is designed for the most powerful EJ engines on the planet. 120lb seat pressure at 35.5mm installed height. 245lbs at 11.5mm valve lift. Coil bind at 22.0mm. 12.5mm max lift. Includes spring seats to set the correct spring installed height. Extreme nose pressure, please use our range of 35mm Subaru EJ DLC buckets KCF-35 for improved parts longevity.