The only 5.7 liter LS engines are the LS1 and LS6 from Corvettes and F-bodies.
I've seen it come up before.
There's confusion in the truck world because the old small-block 350's were still available as the LS engines became available.
The L31 lasted until 2002. If you have a V-8 from 2003 onward in a non-Caddy GM you have an LS based engine.
Odds are, if you have a '99 onward truck, you have an LS based engine. 4.8 and 5.3 liter are most common with a scattering of 6.0 engines.
6.2L have been available in GM trucks in recent years as well, although usually only found in the higher end models.
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