The 427 FE engine became popular in the 1960s as the first power plant for the Big Block Cobra. Our 427 FE engines start with our Aluminum 427 block. Cast in California, these blocks are stronger and 40% lighter than the original cast iron blocks. We have plenty of configurations for you to choose from, ranging from 500-750 horsepower. These engines are the most popular choice for the Shelby CSX6000-series Cobras.