"Duel" actually featured 3 different Valiants :
Novembre 1971 T.V. Movie of the Week version :
1970 model with a 318 , and a 1971 model with a Slant Six
Theatrical Release ( U.K. , Oz , 1972 ) :
The aforementioned '70 318 and '71 225 models , but with a 1972 Slant Six model , which was used...