Incorrect. The gas classes which were the A/Gas, B/Gas, AA/Gas etc were a set of rules (that did change over the years) that dealt with cars that were "Street Equipped" (lights etc.), full fendered cars, with a 10% engine set back allowed. The different classes dealt with a cubic inch per weight formula, with a factor for supercahrged. The rules relaxed some what over the years, originally they had to have full interiors and complete exhaust, but the basic premise of a recognizable street car remained. Near the end they were pretty much full blown race cars, but the basic rules remained. A/FX etc were the factory Altered Wheel base classes - the FX stood for Factory Experimental and they were more radical than Gassers (at least in theory) Altered were a step above both of these and were around before FX cars. Full blown race cars that could run with the Top Fuel cars of the early days. Wild to watch with big blown motors and short wheelbases. Pretty much all three classes were killed by the emerging Funny Cars, but they never "went with the flow and renamed itself" - they were very distinct classes running at the same time.