With 1587cc, the Typ 692/3 motor ran to 6500rpm, came with compression set at 9.8:1 and two huge twin choke Weber 40 DCM/3 downdraught carburettors. A top speed in excess of 130mph and 0-60 in under 8 seconds established the GT as the quickest 356 yet and meant the Carrera's dominance on the track continued. Based on the T-5-bodied 356 B, the 1600 Carrera GT featured a number of unique details on its Reutter-fabricated shell. There were simplified lightweight bumpers without overriders, lightweght aluminium panels for the front lid, doors and engine cover, the latter of which also got two banks of six supplementary cooling vents carved out from each side of the centrally mounted T-5 radiator. Inside, the cabin featured hip-hugging bucket seats, leather window retaining straps and lightweight plastic for the side and rear windows. In early 1960, a new 135bhp Typ 692/3A motor became the most powerful engine available for the 356. Although derived from the Typ 692/3 as its designation would suggest, this revised motor came equipped with two Solex 44 PII-4 carburettors, enlarged main bearing journals, thicker rod journals and six small flywheels to avoid the torsion vibration that regularly occurred at 7000rpm. Compression was left unaltered at 9.8:1. ‘3A’-engined Carrera's were easily the fastest variants yet (other than the trick Abarth-built Carrera's covered in Part 5), top speed now approaching 140mph whilst 0-60 was possible in around seven seconds.