Check the listing for details. 1/2” Blend 4500 Intake to 4150 Carburetor Adaptor Specific For Holley Ultra Xp. Condition: New. Listed at 135.52 USD. Product Description 1/2” blended adator for 4150 Holley Ultra XP carburetors to fit on 4500 intake manifolds. - This adaptor makes it easy to install a 4150 Holley Ultra XP carburetor on a 4500 intake and get more power out of your engine when your at the track - Fits all 4500 intake manifolds - Dyno tested to improve horsepower, torque, and throttle response - Evenly distributes air and fuel - Increases air speed - 1/2” thick for applications where hood clearance is not an issue - CNC machined from 6061-T6 billet aluminum - Black anodized for extended life and a noticeable appearance - DESIGNED FOR THE SLOTTED HOLES OF A HOLLEY ULTRA XP AND WILL NOT WORK WITH OLDER 4150 carburetors Made in U.S.A. Follow us on instagram @ Reapercustoms805