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im getting a aem adjustable cam gear from a friend and im just wondering what kind of performance gain am i looking foward to if I install it into my 1993 ex civic with a d16z6.

also ive never worked with them before so are they hard to set to the way I need it.

 
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Honestly adding an adjustable cam gear really only helps if you are running nitrous or turbo, or an aftermarket camshaft. The gear enables you to retard or advance the camshaft timing. It is most useful to enhance the tuning of the motor when these are in use. If you are just planning on running all motor, stay stock. It is the best way to keep the timing belt from "skipping"(very bad)
Hope this helps.