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Originally Posted by AMERICAN PICK-UP
just fyi sir according to chevrolet the engine DOES make 325 horse power 01 was the first year for the aluminum heads. FACTORY rated at 325 horse power. we build these engines with a cam,headers and a tune they make 500-550 horse all day. thanks. the 5.3 makes 300 horse from the factory.
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I have '01 literature specific to HD's and published values are 300hp/360tq. Internet searches may say 300-325hp but it varied depending on application. for example, yukons were rated at 325. An 01 HD rating from Chevrolet/GMC is 300. The 5.3 in that year is 285hp in the pickups. Just trying to be informative here.