See Figures 1 through 6
The air cleaner consists of a metal housing for a replaceable paper filter or permanent polyurethane element and the necessary hoses connecting it to the crankcase ventilation system. The air cleaner cover is held by a wing nut on all models. If your Corvette is equipped with a paper element, the factory recommends it should be replaced once every 12,000 miles (1963-72), every 24,000 miles (1973-74), every 30,000 miles (1975-82). Inspection and replacement should come more often when the car is operated under dusty conditions. To check the effectiveness of your paper element, remove the air cleaner assembly and, if the idle speed increases noticeably, the element is restricting airflow and should be replaced. Some high-performance models or cars equipped with optional air cleaners use a polyurethane element that must be removed, cleaned, and reoiled at 12,000 mile or 12 month intervals. Remove the filter and clean it in kerosene. Do not use paint thinner or similar solvent and then squeeze it dry. Allow it to soak in SAE 30 oil and again squeeze it dry using a clean cloth to remove excess oil. Clean the inside of the air cleaner housing before reinstalling either type of filter.