COMP Cams Valve Springs, Retainers 26925CS-KIT GM LS Dual Valve Spring Kit w/ Chromemoly Steel Retainers; .660" Max Lift Including properly matched quality dual valve springs, 7 degree locks, viton seals, hardened seats and chromemoly steel retainers, this spring kit is ready to bolt onto LS heads with aggressive cams with up to .660" valve lift. COMP Cams GM LS Dual Valve Spring Kit w/ Chromemoly Steel Retainers - 0.660in Max Lift