There were two big newsmakers for the 1964 Plymouth Valiant Signet. One was Valiant's first V-8 option, the fine 180-horsepower 273 derived from Chrysler's new-generation 318 and also offered for Dart.
But from midseason, the 273 was also available in a fastback Valiant derivative, the Barracuda. Though Signet hardtop sales weren't immediately affected, Barracuda did about two-thirds as well despite its short selling season, a sign of things to come.
Another mild facelift occurred for 1965, when the previous year's full-width horizontal-bar grille gave way to a busier three-section treatment. The V-8 was heated up to 235 horsepower as a new option, but Valiants offered nothing like the Formula S performance-and-handling package available for Barracuda, which was now separated from the Valiant line and outsold the Signet hardtop by better than 5-to-l.
Overall, Signets garnered just eight percent of Valiant's reduced 167,000-unit model-year volume.
A squarish new front with split grille arrived for 1966, the last year for the basic 1963 Valiant design, and a more formal-looking hardtop roofline could be newly capped with a vinyl top. Signet sales went up a bit, but overall Valiant production was the lowest since 1961: 138,000, versus over a quarter-million just two years before.
Then came conservatively styled all-new 1967s that returned Valiant entirely to its original economy-compact role. Wagons went away, hardtops and convertibles became Barracudas, and Signet was merely a better-trimmed pair of sedans above V100s. The name disappeared after 1969, thus ending Valiant's brief fling with sport.
Find specifications for the 1963-1966 Plymouth Valiant Signet in our final section.
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