Fick dating Fürth
Firth and Jane recorded the races first hat-trick of wins when they won the 1963 Armstrong 500 driving a Mk.I Ford Cortina GT at Bathurst (the race had moved to Bathurst that year due to the poor state of the Phillip Island Circuit following the 1962 race).In 1962 the Firth Motors workshop at Queens Avenue, Auburn (Melbourne) became the base for the Ford works team.
The first nine finishers in the race all drove the famed Cooper S.
1967 saw Firth notch up his last victory as a driver in the annual 500 mile race at Bathurst, winning the 1967 Gallaher 500 with a young Fred Gibson in a Ford XR Falcon GT, the first Australian made Ford Falcon to use a V8 engine.
Sydney based racer/designer Frank Matich was scheduled to co-drive with Firth but had to withdraw due to other commitments.
Firth wouldn't have minded so much on missing out on the driving talents of Frank Matich as he was always of the belief that drivers used to being able to drive their specially built race cars hard weren't well suited to Series Production racing where you had to be much easier on what was really a road going car.
Firth and Reaburn also teamed in the 1965 Armstrong 500, but while the winning Ford Works car of Barry Seton and Midge Bosworth was the Harry Firth developed Ford Cortina GT500, Firth and Reaburn finished only 14th outright but won Class A for cars priced under £920 in a Mk. As part of his work with Ford Australia, Firth was recommended as a driver by a young Canadian born Aussie racing in the new Trans-Am series in the United States named Allan Moffat, and he traveled to the US and co-drove with Moffat in an Under-3 litre Lotus Cortina in two races, a six-hour race at the Green Valley Raceway in Smithfield, Texas, and a four-hour race at Riverside in California.