Dual Spring set Kelford Cams for Chevy LS1

CHEVROLET LS1. PAC-1204X RPM Series Dual Spring set of 16. \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. \nHigh spring frequency to allow for better spring surge control at high rpm. \n \n145lb at 1.800" installed height. \n385lb at 0.650" valve lift. \nCoil bind (spring solid height) 1.000". \n \nRET135-16 is the matching Titanium retainer.