A bearing that supports the camshaft journal. On some engines it is full around and pressed in place. On some OHC overhead cam engine the cam shaft bearing is made up of two shells like a connecting rod bearing.
Passage or opening in a four stroke cylinder head for the exhaust valve.
A material that provides a path for the flow of electrical current or heat.
The system you use to remove excess heat from an engine transfer it to the atmosphere. Includes the radiator, cooling fan, hoses, water pump, thermostat and engine coolant passages.