|  | 
| 
			 
			#1  
			
			
			
			
			
		 | |||
| 
 | |||
|  merc 470 
			
			I have a1983 v20 with the 470 in her. I hear a ticking sound when I fire her up. The marina where I fuel only has 87 octane. Could that octane be the cause of the ticking sound or is my 470 showing signs a rebuild is coming my way?
		 | 
| 
 | 
 |