Muscle car dudes and truck guys will be very familiar with the crate engine. For those who aren’t in-the-know, a crate engine is a mill that can be bought from the manufacturer as a fully assembled unit, ready to be dropped into whatever sort of project you have in mind. Buying a crate engine can be a much more convenient way to up your power output than, say, buying a donor car, because it’s already assembled and ready to go in. Not to mention, it’s brand-new.