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I had a customer with a 750HP BB in a 3650lb. car go 133mph at MATS a couple of years ago...D.A. was 4200ft. at the time.



there's a considerable horsepower difference between 127 mph @ 2700 ft and 133 mph @ 4200 feet, don't you think.



What would you mean by that , re-read what he said, i understand it.



4200 ft. is not good air, 2700 ft. really isn't all that bad though. so to answer your question of "what do you mean by that" it doesn't take 711 HP to run 127 mph in "average" D/A. it's more like 620 hp. for a car "like" the op's. now, maybe if the car weighed 3750+ and had a 5-6 mph headwind it would make more sense.
i'm not a "politically correct" kind of guy. i call em' like i see em'. if someone's going to get offended because what i have to say isn't what they want to hear, so be it. thicker skin might be needed in some cases.

machine shop owner and engine builder