Aeroflow Performance cast carburettor hats are the perfect solution for any blow through installation. These EFI carb hats have a contoured designed which promotes optimal airflow, while providing excellent hood clearance (100mm) with a 5-1/8″ (4150) air cleaner flange. These hats feature a 1/8″ NPT reference port that can be used as a convenient hook-up for boost reference or carburetted fuel pressure regulators. The inlet is designed for a 3.5″ silicone coupler, with a sealing lip to ensure a leak free installation. The air cleaner stud entry can be drilled to 5/16″ for installations with larger air cleaner studs. Air cleaner gasket, stud, washer, nut and 1/8″ NPT plug are included.