This is one MEAN sounding 5.3! Does it get any better than a chopping LS! We know that a 5.3L engine isn’t exactly an LS but it’s close enough. A stock 5.3 is a great engine it’s an iron block with thick side walls that just begs for boost. When you toss a cam in one, it can really wake things up and get you into the high 300 HP area, for an engine originally designed as a truck/SUV engine that’s health. The reason people swap these engines into everything is because of the fact that they are so strong and so willing to maker big power!