Well stock is about 360 at the engine, 280 at the wheels from what I've read on the board. Based on just the math, with 540 at the wheels this would be approximately 694 at the engine.
Now of course, real world results will vary so don't rely on it too heavily.
There is about a 25% parasitic loss on these trucks (drivetrain loss from the motor to the rear wheels), so if you are showing 540 hp on a chassis dyno the motor is putting out around 720 hp, not all vehicles have the same percentage rate of parasitic loss, a new corvette for instance has only about 10% parasitic loss.
now im not gonna lie.... 720HP at the crank with a stock motor with just tunine mods is pretty damn impressive
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