Ultimate How-To for Installing a 700+ HP Upgrade for the Chevy LS3 6.2L V8 Working Crate Engines, Mod Kits, and Power Recipes 🔥 Why the LS3 6.2L V8 is the Go-To Engine The Chevy LS3 6.2L V8 is probably the favorite of all the new small-block engines in GM’s legendary LS series—and for good reason.