Moparfarmer, I hate to correct you the the first restrictor was in 1966 on the Hemi so the Fords could stay with them. Remember Chrysler dropped out of Nascar in 1965 in protest of Nascars new rule that made Chrysler run the Hemi only in a C-body car. Along with Chrysler pull out, they took Richard Petty out and had him in Drag Racing. That almost put Nascar under in 1965. Remember that the Hemi was 20 mph faster then the Fords in 1964, So Nascar wanted to stop that in 1965. Never figured they would pull out. After that Nascar tryed to stop Chrysler in everyway they could, Like out lawing the Daytona/Superbird in 1971, outlawing the dual over head cam Hemi ( report at 1000 hp in 1966). To this day Nascar keeps a thumb on Dodge.