To answer your original question ---- why with a simple cam change do these engines make different power levels.
#1 is you must compare dyno sheets AT THE SAME RPM level. So the 525hp motor might be making 480 ish at the same exact RPM's but the 525hp motors cam allowed them to spin it 400 more RPM. HP is a mathematical equation of torque (the only thing really measurable) and RPMS play a major role to get there.
The cam (and heads) is controlling air -- motors are nothing more than air pumps... pump more air = make more power. Pump more air at higher RPM's = larger HP number.
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