One of the function of the cylinder head is to close the top of the cylinder and form a closed cylinder working space together with the piston and the cylinder liner. QSL8.9 Cylinder Head is for Cummins L Series 6 Cylinder 8.9L electronic control engines. If you have to replace the engine head, you may also need the following items:
Intake Valve
Exhaust Valve
Valve Stem Seal
Upper Gasket Kit
Piston
Piton Ring Set
Fuel Injectors
Cylinder Liners
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