The 'K3' was a
direct development of the 'F' type but more power was needed for races like the Mille Miglia. The smaller capacity 'K' type engine was more powerful with its cross-flow head and other lessons learnt from the 'C' type. They fitted wider axles to the 'F' type prototype EX129, and 'K3's also used the wheelbase of the 'F' type. The 'K3's success is well known but it is interesting that Eyston's record-breaking EX135 - perhaps the most famous 'K3' of all - was called the 'Magic Magna' when announced in the press! Prince Bira and Richard Seaman both graduated from 'F' type to 'K3' ownership in their ascendance as successful racing drivers.