Factory Mast LT Cylinder Head - Dual Valve Spring & Titanium Retainer Kit - 0.700 LiftDual Spring Kit for High Lift LT Cylinder Head Factory Mast or OE GM Casting with Factory Guide Size Specs: Rated Valve Lift 0. 700 inches Installed Height 1. 900 @ 150 lbs Spring Rate: 470# in Solid Height 1. 000 Spring OD 1. 290" Spring ID 0. 680" Works well for Limited travel Hydraulic Lifter, or Light Duty Solid Roller Rated for Light to Moderate Endurance Kit includes: Dual Valve Springs Titanium Retainers Chrome Moly Spring Seats Valve Stem