What rocker arms is made up of?

Rocker arms are typically made of materials such as aluminum, steel, or cast iron, chosen for their strength and durability to withstand the stresses of engine operation. They consist of a lever that pivots on a shaft or a fulcrum, allowing them to transfer motion from the pushrods to the valves. Some rocker arms may also feature additional components like hydraulic lifters or roller tips to enhance performance and reduce friction.