Cylinder Head
WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
This cylinder head is of a Dual Over Head Camshaft type. It houses two camshafts that rotate by combustion force made in the combustion chamber and operate (open & close) 4 valves per cylinder. The bottom part of the cylinder head contains the combustion chamber. The material of the cylinder head is an aluminum alloy that has good cooling characteristics and stiffness for protecting it from high temperatures and combustion pressures.
The cylinder head has a water jacket for coolant flow and is fitted with steel valve seats to seal the valves.