The term crate engine refers to new engines as well as used. From complete turn-key solutions to build it yourself short blocks, there are crate engines available for a variety of purposes. While crate engines are often used as replacement engines for vehicles without a working engine, they can also be major upgrades.

Before liters became the typical unit for measuring engine displacement, cubic inches was the standard way of determining engine size. Rather than doing the math yourself, check out this handy engine conversion chart that will tell you the cubic inches, cubic centimeters, and liters of popular engine sizes. If you don’t see your size listed, check out the simple conversion table to calculate your engine displacement!

Engine displacement is the most apparent difference between big block and small block engines, but bore, stroke, and the entire shape of the engine also play a factor. Some engines have a large displacement, but small-block architecture. Find out the differences, similarities, and where each engine style excels.

Turning a six-cylinder classic Mustang into a V8 is a popular conversion. If you've got a great classic Mustang but just wish it had two more cylinders here are all of the necessary components and steps. Whether you want a period correct conversion or a more modern solution, we've evaluated some of the most popular engine choices.