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GM Performance Parts' latest crate engine offering is the 6.2L (that's 376 ci for those that shun the metric system) LS3. Rated by GM at a conservative 436 hp, it comes complete from the fuel injectors on the composite intake to the oil pan. At a street price of just over $6,000, it's not cheap. But when you consider it's an all-aluminum EFI small-block, it's certainly a great bang for the buck.