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					Originally Posted by  cobracosta
					 
				 
				"..........So the question is if you have an aftermarket cam would that cause you to retard your timing more ( from 12' btdc to 20'btdc)..........."[/img][/url] 
			
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when going from 12 degrees BTDC to 20 degrees BTDC you are advancing your timing, not retarding it.
terminology aside, yes. A cam with more duration will generally need more timing (advanced) to completely burn the intake mixture, especially at idle
Z.