No cam. I have long tube headers, x-pipe, high flow cats, intake, 2-3 psi pulley, ported throttle body, 170 thermostat, tune.
Even in track mode with most of the nanny settings turns off in the Z06, my Explorer ST (with mods and tune and in Sport mode) has better throttle response than my Corvette. I have most of the available bolt on mods for the ST. It very well may be a drive by wire difference.
Better throttle response doesn't mean "more power". I've run multiple 2.8 0-60 mph runs and 1/4 mile in 10.28-10.50s @ 138-139 mph on the PDR with Michelin Cup 2s in the Z06. The Explorer isn't even in the same league, nor should it be.