LS Dual 1204X Springs, Ti Retainers, Locators & Stem seals

CHEVROLET LS1. _x000D_\nThis kit includes PAC 1204X Dual Spring (x16), Kelford Titanium Retainer (x16), Steel Locator (x16) and Viton stem seal kit (x16)._x000D_\n_x000D_\nPAC-1204X RPM Series Dual Spring._x000D_\nPremium quality Japanese spring steel wound in USA by PAC. Made with advanced heat treatment processing and surface finishing techniques (nano peening) to extend fatigue life._x000D_\nHigh spring frequency to allow for better spring surge control at high rpm._x000D_\n_x000D_\n145lb at 1.800? installed height._x000D_\n385lb at 0.650? valve lift._x000D_\nCoil bind (spring solid height) 1.000?.