291 Head Value
			 
			 
			
		
		
		
			
			I have a pair of BBC 291 heads. I have had them for years, they are bare and have been magnafluxed. The intake side has  had a very nice gasket match port job. I dug them out to look at the date codes and learned the dates are not very close to each other. One is A 10 70 and the other is F 10 9. How much does this mismatch affect the value? Whats the going price for these things? 
 
TIA, 
 
Jon 
		 
		
		
		
		
		
		
		
		
	
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