text: Specification The road-going XK120's 3.4-litre twin-cam, straight-6 engine produced between 160 and . The C-Type version was originally tuned to around . The early C-Types were fitted with SU carburettors and drum brakes. Later C-Types, produced from mid 1953, were more powerful, using triple twin-choke Weber carburettors and high-lift camshafts. They were also lighter, and braking performance was improved by using disc brakes on all four wheels.  The lightweight, multi-tubular, triangulated frame was designed by Heynes. Heynes, Knight and Sayer together developed the aerodynamic body. Made of aluminium in the barchetta style, it was devoid of road-going items such as carpets, weather equipment and exterior door handles. According to the Jaguar Heritage Registry, the cars were produced between May 1952, starting with XKC001, and ending in August 1953 with XK054. The original alloy body was marked with the prefix K (e.g. K1037).
  Racing
  The C-Type was successful in racing, most notably at the Le Mans 24 hours race, which it won twice.
  In 1951, the car won at its first attempt. The factory entered three, whose driver pairings were Stirling Moss and Jack Fairman,  Leslie Johnson and triple Mille Miglia winner Clemente Biondetti, and the eventual winners, Peter Walker and Peter Whitehead. The Walker-Whitehead car was the only factory entry to finish, the other two retiring with lack of oil pressure. A privately entered XK120, owned by Robert Lawrie, co-driven by Ivan Waller, also completed the race, finishing 11th.