The Moroso carburetor cap for Holley 4500 is molded from high-impact plastic and sized with a 7-5/16 inch diameter neck to fit 4500-style carbs. Offered as a replacement or protective cover, this cap matches the specified neck diameter and is intended to shield the carburetor throat when an air cleaner or intake accessory is not installed.
Moroso Carburetor Cap - Holley 4500 - 7-5/16in Diameter Neck - High Impact Plastic