I also have to question some power numbers that I have seen, especially in the big California car magazines. One magazine article I recall was they took a 100,000 miles, bone stock junkyard 5.0 Mustang,engine ,and untouched from the wrecking yard, it made more power than my Stock Eliminator 5.0 Mustangs engine did! (My Mustang ran 12.3s in legal NHRA trim,, at 3100lbs). As for the origional posters 431, great numbers if they are legit, his hyd cammed, 9.8 compression blows away the .030 over 428, .650" lift solid cam, 11.5 compression dud that ran 10.0s at 132 MPH in my 3100 lb Fairmont, or my 427/428 cranked slug that ran 9.9ETs, yet barely made 500 ft/lbs of torque on the dyno.Funny thing is my turds have ran toe to toe with a couple of similar weight cars with (supposedly 650-700 HP engines.( Different dynos of course.)