However, only the 1969-½ model year Six Pack and Six-Barrel ... year saw the last of the 440 Six-Barrel and 426 Hemi engine options. However, the Plymouth Road Runner would soldier on with ...

The GTX was also available with the 426-cubic-inch (7.0-liter) Hemi ... 1970, Plymouth added the 440 Six-Barrel, good for 390 horses, to the lineup. Unlike the Satellite and the Road Runner ...

In 1967, Plymouth ... Hemi was the only optional unit until 1970 when the engine lineup also included a six-barrel 440-cubic-inch good for 390 horsepower. In 1968, the GTX was joined by Road Runner.