The DB Mk.III resulted from its predecessor, the DB
2. It had a bigger and wider grille and a three-liter
twin-cam six motor.
This was upgraded for this model by the introduction of
a stiffer block and much improved timing chain and intake
Technology taken from the DB3-S racers resulted in larger
valves and higher-lift cam-shafts which caused better
breathing from the car.
The twin SU carburetors stayed. David Brown had supplied
the gearboxes on all DB models. It had a crash first gear
and the option of overdrive on top gear on the MK III
which gave 28.4 per 1000rpm. Girling front discs were
considered an innovative aspect of the Mk.III.