The cylinder head attaches to the cylinder block. A gasket makes a seal between them. Some cylinder blocks have passages to carry oil and coolant. The cylinder head attaches to the cylinder block. A gasket makes a seal between them.
Some cylinder blocks have passages to carry oil and coolant.
Ports in the cylinder head or walls carry air-fuel mixture and exhaust gases. In 4-stroke engines, valves open and close the ports. A rocker arm acts on a valve spring to operate the valve. A cam is a lobe on a camshaft, shaped to control how the valve opens and closes. The camshaft keeps all of the valves working with the correct timing and in the correct sequence.