Ok, I'll give it a try. Bare in mind that I'm not an engineer or some technical wizard.
Horsepower is the amount of work being done by the engine burning the fuel(gas, desiel, etc).
Wait, I'm getting ahead of myself....
Horsepower is defined as the amount of force that is required to lift 100 pounds 100 feet for 1 minute.(I think that's right, if not UNIT5302 can explain it) I'm not sure how torque is defined, but I know that it is directly related to engine size. Ok, given that, let's say you have an engine making 200HP and 250lb-ft of TQ at the wheels. And let's say that it's a 5.0L. Anything that you do to will increase the output(output being HP and TQ). Now, if you have a larger engine, and do the same type of upgrades, you will end up with a higher output figure than the original engine.
Here's why. The larger engine has the ability to move more air and fuel than the smaller one, creating more power. (Which is why I don't understand why the import guys are so cocky) By nature, a 351 will make more power than a 302, and a 302 will make more power than a 289, and so on.
I hope that I haven't confused you any. I don't know if this is as factual as I think it is, but this is what I've come up with. I think it works.
Anyway, later.
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"Is that a Cobra?"
"Yeah"
"It's a V6, right?"
"Yeah"
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