Michigan Motorsports Valve Lock Keepers for LS LT LS1 LS2 LS3 LQ4 LQ9 L83 L86 4.8 5.3 5.7 6.0 6.2 7.0, 7 degree 8mm Valve Locks for stock spring retainers along with BTR TSP PAC MM Dual Spring Retainers. Compatible with ALL Chevrolet LS & LT Series Engines 1997-current (99-2021 4.8L,5.3L,6.0L,6.2L Vortec Truck Engines) LS1, LS2, LS3, LS6, LS7, LS9, GM 4.8L 5.3L 6.0L 6.2L. Also Fits LSX LM7 LR4 LQ4 LQ9 L33 LH6 L92 L76 L99 L96 L82 L83 L84 L86 L87 L82 L83 L84 L86 L87 LT1 L8B LT4 LT5 LT2