the carburettor change was implemented is unknown, with some examples having the Thermoquad and later builds still keeping the AVS. There is considered to be an improvement to engine performance as the flow in the carburettor was increased from 625 cfm to 800 cfm for the Thermoquad. During this option's life, there were other engine variations, e.g. the motors also had a change in the cylinder heads. According to the service manuals, early VJ models maintained heads with 2.02" inlet valves, whereas later heads had a decrease in inlet valve size which saw a reduction to 1.88", again, when this was implemented is not truly known and some early build cars have the smaller valves whereas some later builds have the larger valves. It seems that most E55 versions of the VJ Charger were manufactured during the latter half of 1973. When remaining stocks of the V8 depleted, Chrysler ceased manufacturing cars with option E55 and in late 1974 extended availability of the lazy V8 (from the prestige Chrysler by Chrysler sedan) to the Charger 770 by way of option E57. VJ Charger Sportsman (option A23) In August 1974, a limited edition Charger Sportsman was released, based upon the Charger XL. Built to a quantity of 500 units, all Sportsman cars were painted an exclusive combination of Vintage Red and white, with a combination black and white interior featuring specific cloth trim. These cars were powered by the standard 265ci engine and four speed manual transmission. VK Charger The mildly revised VK series Charger was released in October 1975 in only two variants: Charger XL: , 3spd manual ( and litre engine options) Charger 770: , 3spd manual (, V8 and V8 engine options) The introduction of the VK series saw the demise of the "Six Pack" engine E48 option package, such that only a basic specification engine remained. The Charger was now marketed as the Chrysler Charger rather than as the Chrysler Valiant Charger with Chrysler script badging having replaced Valiant badging front and rear. Some further changes with the VK model included 'white-out' grille treatment, revised rear light clusters, and revised 'C' pillar ornamentation utilising extended fibreglass panels in black, incorporating XL or 770 badge identification. Inside, wiper and windscreen washer controls were now integrated into the indicator stalk and there were also some trim revisions that included bold Boca-Raton cloth seat inserts for the Charger 770. In