The function of the cylinder head is to form the combustion chamber, install fuel injectors, intake valves, exhaust valves, pneumatic valves and other accessories. It also forms cooling water channels, intake and exhaust channels. QSB3.9 Cylinder Head is for Cummins QSB Series 4 Cylinder 3.9L electronic control engines. When you have to replace the engine head, then you may need the following items too:
Intake Valve
Exhaust Valve
Valve Stem Seal
Upper Gasket Kit
Piston
Piton Ring Set
Fuel Injectors
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