Re: ZL1 parts
			 
			 
			
		
		
		
			
			Neat parts!  The 077's are later over the counter heads.  The round port 074's were installed onto the ZL1 block.  Your block is coded 1969 Corvette ZL1.  Is there a vin stamp down by the oil filter location? 
		 
		
		
		
		
		
		
			
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