What looks like a fin dual Quad air cleaner, I've never run it it's just cast aluminum with friends, it's got three holes, Can be run on a four barrel carburetor,I can get more measurements if needed shipping included to the 48 states SOLD just to be clear this is just the top of the air cleaner there's no base or screws included, please ask for measurements if you need to know how big it is you can't tell from the photo