Z/28 engine pulleys  OEM vs. aftermarket
			 
			 
			
		
		
		
			
			I'm asking because I don't know. Why OEM cost 300% more than copies ? 
are the repro that bad ? And why do the repo ones all say not over 400 HP. and don't go over 6000 RPM . This is a 302 I'm building and want to go over 6000 RPM. 
   Please enlighten me on pulleys I want to know. 
            THank You
		 
		
		
		
		
		
		
		
		
	
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