M38A1 vent tube
			 
			 
			
		
		
		
			
			It has just come to my attention that many M38A1's have a vent tube from the valve cover to the oil fill tube. I do not have this on my 67 CDN2....what was this for and can the lack of this vent tube cause high oil consumption?  
 
Thanks in advance, 
 
les
		 
		
		
		
		
		
		
		
		
	
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