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Originally Posted by X-TECH MAN
And what does that tell you? Its not all tire technology and ring packs....Maybe the air is better today than back in the 60's and 70's?
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It's any number of things. Granted valve springs have allowed a lot. But clutches, carburetors, torque converters, headers, and transmissions have come a long way. There's a ton of things that have gotten better, and racers have gotten smarter because there's more information available as well. Information and knowledge make a lot of HP.