The 632 cubic-inch big-block, the most powerful engine Chevy ... LS3 crate engine. Take the word "complete" here with a grain of salt, as there are some things you should know about crate engines.

While the LSA might be the more powerful of the two engines, that power does come at a price. The LSA engine was nearly twice as expensive as the LS3 when it was still available as a crate engine ...