The Mk4 had its first outing in the non-Championship Brussels Grand Prix where it qualified in the midfield but failed to finish. Its first World Championship race was the 1962 Dutch Grand Prix. By now the cars were fitted with the more powerful Climax "FWMV" V8 engine; the meeting went somewhat better with John Surtees qualifying his car in pole position. Once again though, poor reliability let the race performance down, and neither car reached the finishing line. Surtees took the car's first victory in the 2000 Guineas race at Mallory Park in the middle of the season, but excess chassis flex impeded his Championship hopes.