Engine: LS1 Displacement: 5.7L The Gen-III “LS” small-block made its debut in 1997 in where else but under the long, low (a characteristic feature permitted by GM’s re-commitment to pushrods ...

383-inch LS built from 5.3L Vortec blocks makes over 540 hp on the Westech Dyno If you know a few pieces of information, you can turn a Vortech 5.3L block into an LS mill making way over 500 hp ...