Gen 4 Grand National car represent a level lower from the top stockcar cars during Gen-4 era, before the transition to the Car of Tomorrow (CoT). While visually sharing the same aerodynamic sheet metal bodies as their Cup Series counterparts, the Grand National cars were built on a shorter 105-inch wheelbase. Under the hood, the series mandated a 9:1 compression ratio and smaller 390 CFM carburetors, capping the 358 cubic-inch V8s to around 600-650 horsepower. Lighter, slightly less powerful than Cup Series cars of that era, these highly agile cars required massive momentum preservation and smooth pedal inputs to maximize performance.
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