The Ford Super Duty engine was a truck engine from Ford Motor Company.The Super Duty was introduced in 1958, the same year as the FE and MEL series V8 engines, as a replacement for the Lincoln Y-block in truck applications. The Super Duty was available in displacements of 401, 477 and 534 cubic inches (6.6L, 7.8L and 8.8L). These engines were large, heavy, high torque engines and operated at a relatively low RPM.