Re: Ls swap
There's no difference in serpentine belts between a 4.8 and a 5.3, the difference is in which alternator you have. There are two different sizes, so you probably got a belt for the opposite alternator that your engine has. As for telling if its a 4.8 or 5.3, you can take a plug out and shine a flash light in the cylinder and see if the piston is flat or dished. Flat is 4.8 and dished is 5.3. You can also take a wire and feel it if you cant see it.
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