Joel, I was there at Martin today and ask about the air filter.
Their response was; "L-88's didn't come with an actual filter, just a wire screen, according to the factory assembly manual,"
Since I don't have an assembly manual (not gonna buy one either), evidently I was wrong earlier. I'll have to take their word for it.
John, I think you know better than to take a Chevy driving FAST racer at his word! Of course they had a foam element around that screen. It's tiny and it kills power.
https://www.ecklerscorvette.com/1967-1969-corvette-air-cleaner-foam-element-l88-25-123937-1.htmlhttps://corvetteparts.com/item/air-cleaner-assembly-427-with-l-88-engine-option-1967-1969