Hygrade FL12 Carburetor Float

Holley Carburetor Float for Classic V8 Applications

The Hygrade FL12 carburetor float is a Nitrophyl replacement for Holley 2-barrel and 4-barrel carburetors. It is built for classic Ford, Mercury, and Chevrolet applications that use Holley 4150 or 4160 carburetors, including primary float service on many 1963-1969 vehicles.

Key Features

• Nitrophyl construction for carburetor float service
• Fits Holley 2 Bbl. and 4 Bbl. carburetors
• Application coverage for Holley 4150 and 4160 carburetors
• Used in primary float positions on listed vehicles
• Hygrade FL12 part number for direct catalog lookup

Detailed Description

Hygrade FL12 is a carburetor float for Holley 2 and 4 barrel carburetors, made from Nitrophyl for use in fuel level control inside the carburetor bowl. This part is listed for a wide range of classic Ford Mustang, Ford LTD, Ford Thunderbird, Mercury Cougar, Mercury Marquis, Mercury Montego, Mercury Colony Park, Mercury Villager, and Chevrolet Bel Air, Corvette, Impala, and Malibu applications with Holley 4150 or 4160 carburetors. This part cross-references 2-407 and CF260 for the same application.

Vehicle Fitment

• Fits 1965-1969 Ford LTD, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1967-1969 Ford Mustang, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1963-1969 Mercury Colony Park, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1967-1969 Mercury Cougar, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1969 Mercury Marauder, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1963-1966 Mercury Marauder, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1967-1969 Mercury Marquis, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1968-1969 Mercury Montego, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1969 Mercury Montego, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; w/ Hi-Perf. Eng.; Primary
• Fits 1963-1968 Ford Thunderbird, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1968 Mercury Cougar, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; w/ Hi-Perf. Eng.; Primary
• Fits 1966-1967 Mercury Capri, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1967 Mercury Capri, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; w/ Hi-Perf. Eng.; Primary
• Fits 1967 Mercury Colony Park, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; w/ Hi-Perf. Eng.; Primary
• Fits 1964-1967 Mercury Villager, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; Primary
• Fits 1967 Mercury Villager, N/A, w/ Holley Carb.; 4150, 4160; C5AF-BT, R2855; w/ Hi-Perf. Eng.; Primary
• Fits 1963-1965 Chevrolet Bel Air, N/A, w/ Holley Carb.; Hi-Perf.; 4150; R2818; Primary
• Fits 1963-1965 Chevrolet Corvette, N/A, w/ Holley Carb.; Hi-Perf.; 4150; R2818; Primary
• Fits 1963-1965 Chevrolet Impala, N/A, w/ Holley Carb.; Hi-Perf.; 4150; R2818; Primary
• Fits 1964-1965 Chevrolet Malibu, N/A, w/ Holley Carb.; Hi-Perf.; 4150; R2818; Primary

Common Problems This Part Can Address

• Incorrect fuel level in a Holley carburetor bowl
• Float saturation or loss of buoyancy from worn original parts
• Fuel delivery inconsistency at idle or under load
• Hard starting caused by improper carburetor fuel control
• Driveability issues related to a damaged primary float

Installation Notes and Tips

Verify the carburetor model before ordering, especially Holley 4150 and 4160 units. Match the application notes, including primary position and any high-performance engine references, to the vehicle and carburetor currently installed. Clean the carburetor bowl and inspect related fuel system components during service to help ensure stable float operation.

Quality Assurance

Hygrade has supplied the automotive aftermarket since 1919 and focuses on broad carburetion coverage with replacement parts built for classic fuel system service. FL12 is cataloged for multiple Ford, Mercury, and Chevrolet Holley carburetor applications, supporting accurate replacement selection for restoration and maintenance work.