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25-30hp, like cobra said above. An aggressive cam sounds awesome at idle. It has that nice rumble, I don't know how to describe it. Like *brum brum brum brum brum*. lol
also a LOT of money or time. probably money because cams are a little too much for the everyday guy. at least in the pushrod 3.8 it is. you have to take like the whole engine apart.