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Making the allowable error small -- tightening the tolerances -- helps the engine achieve its maximum potential power and also helps reduce wear.
Hmmm...International Harvester was doing that to their truck engines in the 1960's. "Every engine balanced and blue-printed." Come to think of it, If anybody knows of 3/4 ton IHC with an I-6 in it, let me know. I've always wanted another one.
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(Who the hell was it who tried to claim that Indy, F-1, CART, and Champ contribute more to crumple zones than NASCAR? Have you ever even watched any of those races? Street cars aren't supposed to bloody disintigrate on impact!)
No, they are supposed to absorb the impact. Check out the egg-crating in modern bumpers. Think about how a modern car reacts in a crash as opposed to a sixties muscle car or a NASCAR car.
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Yet, you're stopping with the engine as if the engine is the entire car. Not hardly. An engine on its own won't get you anywhere, and certainly not very fast.
Yeah, let's think about the entire car. How does a unibody FWD v-6 street car become a full frame RWD v-8 NASCAR car? It doesn't. NASCAR cars are built from the ground up.
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Sure, until you consider the brakes, the chassis, the suspension, the steering, the transmission, the body...
There's no ABS in NASCAR, but all modern cars have it. There hasn't been a tunable chassis in a street car since a couple of Dodges in the 60's/70's. Same with the suspension, although some cars have a computer adjusted suspension, it isn't really tunable in the same way. NASCAR steering is the same basic system as in the Big Green Truck...hardly modern. Not a lot of American street cars have a 4 speed standard transmission, and the ones used in NASCAR haven't changed significantly for decades. NASCAR bodies bear a slight resemblance to their street-car cousins, but are modified to fit NASCAR templates. Park a NASCAR beside its street-car namesake and even the body lines are different. That's without getting into doors that don't open (or even exist), a front valance with the headlights painted on, roof flaps, and a dozen other little things.