Re: air cleaner I.D.
Does the indentation line up with the hole in the valve cover for the PCV valve? Looks like there is no hole on the pass side base bottom for the PCV intake pipe and screen then they would have to use a breather on the driver side valve cover. There was a breather can that used a vent tube and no PCV valve so that indentation may be there for clearance. I believe Chevy had a cowl intake system available starting in 1963 to make it legal for NASCAR. They ran both Chevelles and Passenger cars in NASCAR in the mid 60s so the cowl system was probably designed to fit both. I have an original picture of an 66 Motion Chevelle with the factory service cowl system but couldn't find it.
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