Cast aluminum lid construction with stamped steel baseplate for optimal durability 1/2 inch raised baseplate fits single 4-bbl carburetor setups with a 5-1/8 inch diameter neck and clears standard throttle linkages with ease Oversized oval shape gives a true old school feel to your engine bay that can’t be replicated with standard sized oval air cleaners Includes 2.5 inch tall, premium cotton gauze filter element for excellent filtration Filter element comes pre-oiled, and is washable and reusable (filter care instructions are included)