Fits:1939 to 1953 F1 Mercury Cars with a Flat Head V-8 239 - 272" cid Engine When installing the carburetor for the first time, please use carburetor cleaning agent to spray cleaning agent on the fuel inlet pipe of the carburetor to help lubricate the needle valve. This is because the carburetor has been stored in the warehouse for a long time and the needle valve is a bit dry. New carburetor, engine test, with good sealing You need to check whether the air filter interface of your original carburetor is the same as that we sell Retro carburetor requires experience in carburetor installation If you have any questions after receiving the carburetor, please contact us by email We will provide high-quality after-sales service, thank you!