I couldn't find any information on an Aston Martin model called the "Valiant". However, I can provide a summary of the Chrysler Valiant, which is a different car.
The Chrysler Valiant was a series of automobiles produced by Chrysler Australia from 1962 to 1981. The Valiant was first introduced in 1962 and was based on the United States-market Dodge Dart. It was marketed as a mid-size car and featured a range of engines, including a 3.5L inline-six cylinder and a 4.1L V8.
The Valiant was known for its durability and reliability, making it a popular choice among Australian motorists. Over the years, the Valiant underwent several facelifts and updates, with the most significant change being the introduction of the second-generation model in 1966. This updated version featured a new dashboard design, improved suspension, and a range of trim options.
The third-generation Valiant was introduced in 1971 and featured a more angular body style and a revised engine lineup. The final iteration of the Valiant, which was released in 1975, featured a new front grille design and a range of interior upgrades.
Throughout its production run, the Chrysler Valiant was available with a variety of engines, including inline-six, V8, and V6 options. It also featured a range of trim levels, from the base model to the high-performance Valiant Charger.
The Chrysler Valiant played an important role in Australian automotive history, being one of the first locally built cars to achieve significant sales success. However, with the introduction of more modern designs and changing market trends, production of the Valiant ceased in 1981.