The car was entered at the 1969 British Grand Prix as a test run. Whilst Rindt finished fourth in the older 49 behind Jackie Stewart after running short of fuel whilst leading, Miles could only bring the 63 home in 10th place, confirming the car's uncompetitiveness. After several other fruitless outings, the 63 was abandoned, but parts of the chassis design were worked into the Lotus 72, which debuted in 1970.