Cam button

What is the cam button, where is it located and what does it do?

keeps cam from walking it is located on the end of cam and rides against the timing cover. if you are looking to getting one then i would go with a roller because the stock one eats into the timing cover
 
Ok thanks. My old one didnt have one!! Stupid guy that rebuilt it screwed it up bad
 
So it should go on the "distributor" gear part and up against timing cover? Any diagrams? I am a very visual person
 
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