The new XY GT rolled off the line in late 1970, and was followed in 1971 with the all-time classic GT HO Phase III. With between 350 and 380bhp (270 - 280 kW) and 380 ft/lbs (513Nm) of torque, it was reputed then to be the world's fastest 4-door production car.

Looking suitably aggressive8 with its air intake protruding through the bonnet and bold side stripes, the XY GT's were affectionately known as "Shakers" to many people, a nickname derived from the shaking action of the bonnet scoop and particularly noticeable while the engine is idling.

There were 1,557 XY GT's made from September 1970 to December 1971. There were 300 XY GTHO Phase III's built between May 1971 and November 1971.
Engine Specifications:

Engine Specifications:

• Engine: 351 cubic inch Cleveland V8 (5.763 litre)
• Bore & Stroke: 102 x 89mm (4.00 x 3.50in)
• Power (DIN): 224kW (300bhp) @ 5400rpm. Note: Output was understated as 300bhp to satisfy insurers. Generally accepted as 350-380bhp
• Torque (DIN:) 515Nm (380lb-ft) @ 3400rpm
• Compression Ratio: 11.5:1
• Configuration: Front mounted, longitudinal, 90 degree V8
• Head Design: Pushrod & rocker OHV with solid lifters. Note: 2 optional lifts available with the same duration
• Exhaust System: H&M headers with low restriction twin exhaust
• Fuel System: 780cfm Holley 4 barrel carburettor
• Ignition System: Twin point distributor
• Larger harmonic balancer
• 6150 rpm rev limiter
• Windage tray and baffles in sump

• Type: 4 speed all-synchronised
• 1st: 2.32:1
• 2nd: 1.93:1
• 3rd: 1.36:1
• 4th: 1.00:1
• Reverse: 2.78:1

• Type: 4 speed all-synchronised close ratio
• 1st: 2.32:1
• 2nd: 1.69:1
• 3rd: 1.29:1
• 4th: 1.00:1
• Reverse: 2.78:1

• Type: 9in LSD Traction Lock is standard with 28 spline axles or 31 spline optional
• Ratio: 3.25:1 standard with optional 3.5:1 or 3.91:1 (Optional)

• Front: Independent ball joint, HD coil springs, HD shock absorbers, wishbones and HD anti-roll bar
• Upper control arm to accept the 3 pin ball joint used, as opposed to the 4 point ball joint used in the normal GTs and earlier GTHOs
• Rear: Hotchkiss type with semi-elliptic leaf springs, shock absorbers, live axle and rear anti-roll bar added
• Wider front track due to the use of XA type 3 pin upper control arm
• Spacers on front when Globes fitted

• Front: 286mm (11.25in) Servo assisted Discs with dust shields removed
• Rear: 254mm (10in) Servo assisted Drums. Wider & finned plus proportioning valve fitted

• Type: Re-circulating ball power assistance (Optional)
• Ratio: 16:1

• Wheels: 6.0 x 14 Steel - Steel '5 Slot' with S Steel dress ring & centre cap
• 7.0 x 15 Alloy - '5 Spoke' Globe Daytona(Optional) from 1972
• Tyres: 185 x 14 - E70HR14

• Speedometer: 140mph
• Cleveland Tachometer: 8000rpm
• Oil Pressure: Gauge
• Water Temperature: Gauge
• Fuel: Gauge
• Ignition: Warning Light
• High Beam: Warning Light
• Brakes: Warning Light
• Clock: Analogue

• Length: 4689mm (184.6in)
• Width: 1869mm (73.6in)
• Height: 1397mm (55.0in)
• Weelbase: 2819mm (111.0in)
• Front Track: 1499mm (59.0in)
• Rear Track 1486mm (58.5in)
• Weight: 1524kg (3360lb)
• Turning Circle: 11.2m (36.6ft)
• Fuel Tank: 163.8 litre (36.0gl) standard
• Seating: 5

• Top Speed: 225km/h (142mph) @ 6150rpm with 3.25:1 differentail
• 0 - 60mph (0 - 100 km/h) - 6.4 seconds
• Standing 1/4 mile (400m) - 14.2 seconds