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Built to race, sold as a sedan
The Phase III was Ford Australia's 1971 Bathurst homologation special: a four-door XY Falcon with the GT-HO program's most developed 351 Cleveland package. Ford built 300, enough to make it a real production model while keeping it scarce from new. The result looked like a muscular family sedan but carried the cooling, fuel capacity, gearing, suspension, brakes, and aerodynamic equipment intended for sustained competition.
What Phase III changed
Its 351 Cleveland 4V used an 11.5:1 compression ratio, 780 cfm Holley carburetor, baffled sump, freer exhaust, stronger bottom-end preparation, and improved cooling. Ford advertised 300 hp. Specialist and registry references commonly place output around 370 to 380 bhp, but that estimate should not replace the factory rating. A four-speed Toploader and limited-slip nine-inch rear axle completed the standard driveline, with build records needed to resolve the exact transmission and ratio fitted to a particular car.
More than stripes and spoilers
The front air dam, adjustable rear wing, Shaker hood, GT striping, and five-slot steel wheels gave the Phase III its recognizable shape. Inside, it remained close to an XY GT: bucket seats, console, floor shifter, sports instruments, and GT trim. That restraint is part of the car's appeal. It did not need a two-door body or flamboyant cabin to become one of Australia's defining muscle cars.
Reading a genuine car
Start with the model and engine information on the build plate, then reconcile the body number, engine number, transmission and axle tags, paint and trim codes, and original paperwork. Model 18138 and H engine identification are important starting points, not proof by themselves. Spoilers, stripes, a Shaker, or even a Cleveland swap can be reproduced. The strongest case follows the whole car through its factory record, component dates, construction details, and ownership history.