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| GMC V6 and V12 Engines Engine repair and rebuilding | 
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			#11  
			
			
			
			
			
		 
		
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			I have a set of magnum heads, but I don't have the casting number handy. I am planning on flow testing them at a later date. When I do I will post the results here.
		 
		
		
		
		
		
		
		
		
	
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			#12  
			
			
			
			
			
		 
		
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			I created a new thread for the Magnum head flow testing. 
		
		
		
		
		
		
		
		
	
	https://6066gmcclub.com/showthread.php?t=50774  | 
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			#13  
			
			
			
			
			
		 
		
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			 Quote: 
	
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