Black Label LS & LT - Dual Valve Spring & Titanium Retainer Kit - 0.660 LiftFits all Black LABEL LS & LT Cylinder heads and all Aftermarket LS & LT Heads with 0. 575 aftermarket valve guide Specs: Rated Valve Lift 0. 660 inches Installed Height 1. 800 @ 166 lbs Spring Rate: 403# in Solid Height 1. 015 Spring OD 1. 310" Spring ID 0. 680" Works with aftermarket 0. 575 Valve Guide Kit includes: Dual Valve Springs Titanium Retainers Custom Thick Chrome Moly Spring Seats Valve Stem Seals Billet Machined Chrome Moly Valve Locks