12499225 12595365 17122490 HL124 LS7 Hydraulic Roller Lifter Set Replacement for LS1 LS2 LS7 Series (16 Pack) LS3 LS6 LQ4 LQ9 LY5 LY6 LM7 4.8 5.3 5.7 6.0

Installation 1 Please check whether the engine oil is clean enough; 2 Before installing the hydraulic tappet, it should be diffused into the oil 3 Use your fingers to test the support seat in the center of the hydraulic tappet, and then select a strong support without settlement or settlement. 4 When installing, please try to prevent oil from overflowing from the inner cavity of the hydraulic tappet 5 If there is still air entering the hydraulic tappet and causing noise, please follow the "Exhaust Step" to eliminate the noise 6 During the installation process, do not try to rotate the camshaft, if it is indeed unavoidable, it should be reduced to the smallest possible extent; 7 When the camshaft needs to be rotated, the camshaft should be rotated as continuously as possible, and a single stop action should not be performed. Stop in a different position each time 8 Before starting the engine, refueling steps should be performed as much as possible to reduce the chance of air entering the hydraulic tappet; Note: There is no manual

• Direct Fit: Manufactured with high-quality durable materials and precision CNC machining, it can meet the requirements of racing lifters and can withstand continuous high-speed operation
• Replacement OEM : 12499225, 17122490, 12576400, 12648846, 17109057, 17120090, 17120735, 17121905, 25341990, HL124
• Fitment: Fit for LS1, LS2, LS3, LS6, LS7, LS9 LSX Engines (4.8L, 5.3L, 5.7L, 6.0L, 6.2L)
• Function:The valve lifter will effectively fill all the gaps of the valve mechanism, and there is no gap between the roller and the camshaft to avoid the knocking sound of the hydraulic lifter. Achieve long-term use, maintenance-free performance design
• Engine valve lifters automatically help maintain a "zero" valve lash state, helping to prevent valve train noise and unnecessary wear on valve train components. The valve lifters are built to fit your vehicle and provide the same level of performance you'd expect from a GM performance, durability and longevity.