Carburetor Float, Rochester 4 barrel, 1952-57 Oldsmobile, 1952-56 Cadillac Carburetor float for all 1952-57 Oldsmobile 303, 324 and 371 V8 engines with Rochester 4 barrel carb. Also used on 1952-56 Cadillacs with Rochester 4 barrel carburetor. This float is used for both primary and secondary applications, sold each.