By April 1968 the 428 "Cobra Jet" engine, soon to be known as the Cobra GT 500KR, is being installed in the Mustang. The engine is very much under rated at 335 hp (250kW) and will develop 440 ft-lbs of torque at 3400 RPM. After the Mustang win over the Ferrari at Le Mans in '67 and '68, the Shelby KR engine is left stock, but die cast aluminum valve covers are added with "Cobra Lemans" emblazoned on them to mark the Ford FE engine victory. The name was retired before the 1969 model year, only a couple of months before Shelby ended his contract with Ford.
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