They're calibrated for use on stock to mildly modified vehicles and have that classic Holley look, Gold Dichromate coated for durability, Intake to carb gasket and air cleaner gasket included, This carb adapter includes gaskets for both top and bottom sides as well as mounting hardware, Adapter measures 1/2" tall, This chrome plated steel 4 barrel (5-1/8" neck) air cleaner.