You might have heard of this popular car part before but have you seen one?
Valve Cover Gasket—The valve cover goes on top of the motor and covers the rocker arms and push rods in the cylinder heads. Valve cover gaskets can be made of rubber or cork material.  A four cylinder vehicle will have one valve cover,  a six cylinder can have one long valve cover (this type of engine is called a straight six) or it can have two covers if it is a V-6 engine,  and eight cylinder engine will have two valve covers.