the base engine on full-sized Ford sedans. Later in the model year, its availability was expanded to the Ford Falcon and Mercury Comet. The early "1964½" Ford Mustang also offered the 260, although it was dropped at the end of the 1964 car model year. Ford ceased production of the 260 at the end of the 1964 car model year with approximately 604,000 units having been made. XHP-260 The special rally version of the Falcon and Comet and early AC Cobra sports cars of 1962 used a high-performance version of the 260 with higher compression, hotter camshaft timing, upgraded connecting rods, valves with larger diameter valve stems, stronger valve springs and a four-barrel carburetor. This engine was rated (SAE gross) at 5800 rpm and at 4800 rpm. This engine was termed the HP-260 by Ford and was specifically made for Carroll Shelby – about 100 were made. Sunbeam Tiger The 1964–1966 Sunbeam Tiger Mk I used the 260. The 1967 Sunbeam Tiger Mk II used the 289 ci in V8 when the 'build ahead' stocks of the 260 ran out. 289 The was also introduced in April 1963 and was also called the Challenger V8. Bore was expanded to , becoming the standard bore for most small block engines. Stroke remained at 2.87 inches. The 289 weighed 506 lb (230 kg). In 1963, The two-barrel 289 replaced the 260 as the base V8 for full-sized Fords. The base version came with a two-barrel carburetor and 8.7:1 compression; it was rated at (SAE gross) at 4,400 rpm and at 2,200 rpm. D-code In 1964, an intermediate performance version of the engine was introduced with a four-barrel carburetor and 9.0:1 compression, rated at at 4,400 rpm and at 2,800 rpm. The engine was an option on the 1965 Ford Mustang and was known as the "D-code" from the letter code used to identify the engine in the VIN. The D-code engine is relatively rare, as it was only offered as an optional engine in the latter half of the 1964 model year. Cyclone This engine was marketed in the 1964 Mercury Comet Cyclone as the "Cyclone" and carried a K-code in its VIN. This engine is not the same engine as the HiPo K-code engine offered in Ford vehicles. C-Code For 1965, the compression ratio of the base 289 was raised to 9.3:1, increasing power and torque to at 4,400 rpm and