1951 Cadillac Dualis 5.7 in Golden Fleece, QLD. 1951 Cadillac This 1951 Cadillac, 331cubic inch, 4 speed gearbox has been kept in original, rust free condition, with good original patina. It has excellent floors, brand new rebuilt gearbox (here in Australia), new brakes, new master cylinder and good tyres. It has near new interior, it just needs a hood lining.