The first year that Ford used a 200 cubic inch (3.3 liter) displacement engine in a Mustang was in 1965 (August 1964 onward). It was a 120hp, 6-cylinder engine known as the Thriftpower Six and was standard. The Mustang continued to use the 200 as its base engine until it was dropped in 1971. In 1979 a 200 cubic inch (3.3 liter) displacement engine offering was re-introduced and used in 1979, 1980 and 1981 model years. After that it was just too small to drive the monstrous 1971, 1972 and 1973 Mustangs so it was eliminated from the Mustang engine line and replaced with a bigger 250 cubic inch engine.