Features :
5.3 AFM Lifter Replacement Kit Head Gasket Set, Head Bolts Lifters and Guides.
The hydraulic lifter in a car's engine uses oil pressure to adjust a plunger and take up all the clearance in the valve train.
This helps to ensure less engine noise and longer reliability, due to less wear and tear.   
The head gasket is the key component of the engine

Kit Includes:
8 AFM (Active Fuel Management) Hydraulic Roller Lifters / Engine Valve Adjusters
8 NON-AFM (Active Fuel Management) Hydraulic Roller Lifters / Engine Valve Adjusters
4 AFM Lifter Tray w/ Bolts
30 Cylinder Head Bolts (20 Long Bolts: 100mm, 10 Small Bolts: 45mm)
Multiple Layers Steel (MLS) Head Gasket
Valve Cover Gasket
Valve Stem Seals
Intake Manifold Gasket (Aluminum)
Exhaust Manifold Gasket
Front Camshaft Seal
O-rings
Other Small Gaskets
RTV Silicone