Quote:
Originally Posted by 1_2Many
Not sure about modern HEMI engines, but back in the 60's the 425 hp rated motors were making upward of 600 hp on a dyno.
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Yeah, but those tests were completely different and not representative of real-world conditions. I believe many tests like that didn't have the exhaust system intact, no accessories, no air filter, and a bunch of stuff like that. Like another person said, there are correction factors that can be altered and conditions that could account for those numbers. ZL1s were rated to close to and above 600 horse too, but that was with a different tune, headers, no accessories, etc. Nowadays, there are so many differences that I BET the modern HEMI gets very close (well, within 50 horse' or so) to the second generation HEMI if tested in the same fashion. It's not representative though of driving the car on the street. If you look at the ET and trap speed of those cars, they were pretty similar to the likes of many COPO GM cars and a few Fords. Anyhoo, it seems that those numbers are pretty inflated or the information misrepresented. No biggie though.