Has a 15.5 gallon capacity and measures 24-1/2" x 25" x 8", Filler neck included, No modification needed to your car and it looks like an OE tank when installed in your 1957 Chevy, Features a coated galvanized steel construction with a silver powder coated finish, Includes a EFI-style internal baffling with 4.3 liter internal fuel tray to prevent fuel pump starvation.