Editing Rocker arms

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==Overview==
There are several types of rocker arms. Regardless of the type, the job of a rocker arm is to transmit the action from the lifter and pushrod following the cam lobe to the valve.

==Types==

===Stamped steel===
A mainstay of OEM engines. They're cheap to produce and perform adequately, although in serious competition and high performance applications they leave a lot to be desired. The ratio is often less than advertised, the ball pivot like used by Chevy and Pontiac are prone to wear and friction.

===Roller tip===
The roller tip only rockers are mostly a gimmick. Their only real advantage comes not from the roller tip, but from the more accurate ratio- stock stamped steel rockers have less than advertised ratios in many cases.

===Roller trunnion===
Chevy Gen 3 and 4 engines use a roller trunnion without a roller tip. These rockers are very efficient and represent the state of the art as far as OEM rocker arms go. These rockers can be upgraded with a replacement trunnion bearing assembly and are then good for high performance use beyond what the stock bearings could take.

[[File:LS7 stock rocker arms.jpg]] <br style="clear:both"/> 

===Full roller===
Aftermarket rockers are available as full roller (tip and trunnion). The benefits are less friction and less oil needed to lubricate them.

===Self aligning vs. non self aligning===
[[File:SA vs non sa rockers.jpg]]

[[Category:Cylinder head]]
[[Category:Undeveloped articles]]