Thumper,

They are the old style sort of heart shaped air cleaners without filters. Also located under the air cleaner cover, I have some fine screens as an additional layer. No close up pics here at the office, but here are a couple of underhood pics.

Problem with mine is I am using an old Eddy STR cross ram intake. It is modified to make the carbs into an inline setup, but they are too close together for most filters. Setting these up back to back with some small mods, plus the additional screen inside gives me protection from debris, but it is still not as good as a regular filter. The extra screens underneath are fine veggie strainers with the handles cut of LOL.

-Dave