Restore Engine Performance: If your engine is suffering from composite valve system issues (including noise, low power, and oil burning), this lifters camshaft kit is a great value option to bring back optimal performance. Increased Strength: The cam, after high-frequency hardening, has higher density and hardness, enabling it to resist the corrosion of engine oil and coolant in harsh operating conditions. Enhanced Wear Resistance: The camshaft, lifters, and pushrods are made from durable grey cast iron, offering excellent wear resistance and fatigue strength. They can withstand thousands of impacts per minute in the engine, reducing wear on the contact surfaces between the cam lobes and lifter pillars. Complete Kit: This camshaft kit (OE: 12625437, SP011-16) comes with 13 essential components, including the camshaft, lifters, lifter bases, pushrods, springs, timing cover gasket, front crankshaft seal, cylinder head gasket, water pump gasket, and more. All core parts are designed to match OEM specifications. High Compatibility: Our lifters camshaft kit is compatible with NORRIS trucks from 1999-2013 GM Gen3/4. Fits 1999-2013 LS-based engines (Silverado, Sierra, Tahoe, Yukon/LS1, etc.), suitable for 4.8L, 5.3L, 6.0L, and 6.2L engine displacements. For more compatibility details, please refer to the image.