Book excerpt: The 6-cylinder XK engine was fitted to Jaguars for nearly 30 years, from the mid 1950s to the mid 80s. It still ranks as one of the most famous British engines having been used in a number of specials and kit cars. Here Pollard follows the XK from its initial conception and production to its final use in the mid-1980s. Pollard provides photos of the engines and the cars they powered, and offers identifying specs and production changes. Step-by-step illustrations show how to restore and rebuild an XK engine to its original specs.