Australian Muscle

Australia developed its own muscle cars around the same period, the big three manufacturers being Ford Australia, Holden or Holden Dealer Team (by then part of General Motors), and Chrysler Australia. The cars were specifically developed to run in the Armstrong 500 (miles) race and later the Hardie Ferodo 500. The demise of these cars was brought about by a change in racing rules requiring that 200 examples had to be sold to the general public before the car could qualify (homologation). In 1972, the government banned supercars from the streets^{[citation needed]} after two notable cases. The first instance was a Wheels magazine journalist driving at 150 mph (240 km/h) in a 1971 Ford XY Falcon GTHO Phase III 351 cu in (5.8 L).^[39] While the car was getting exposure in the press, the second incident occurred in George Street, Sydney, when a young male was caught driving at an estimated 150 mph (240 km/h) through the busy street in a 1971 Ford Falcon GTHO Phase III, drag racing a Holden Monaro GTS 350. This was known in Australia as "The Supercar scare".

Ford produced what is considered to be the first Australian muscle car in 1967, the 289 cu in (4.7 L) Windsor – powered Ford Falcon GTXR. Months later, in 1968, Australia would see its first homegrown two-door muscle car, the Holden Monaro GTS 327. Ford continued to release faster models, culminating in the Ford Falcon GTHO Phase III of 1971, which was powered by a factory modified 351 Cleveland. Along with its GT and GTHO models, Ford, starting with the XW model in 1969, introduced a "sporty" GS model, available across the Falcon range. The basic GS came with a 188 cu in (3.1 L) six-cylinder engine, but the 302 cu in (4.9 L) and351 cu in (5.8 L) Windsor (replaced by the Cleveland engines for the XY) V8 engines were optional. Ford's larger, more luxurious Fairlane was also available with these engines and could also be optioned with the 300 bhp (224 kW) 351 cu in (5.8 L) "Cleveland" engine.

General Motors Holden produced the Holden Monaro with 161 cu in (2.6 L), 186 cu in (3.0 L) (186 and 186S specification) 6-cylinder engines, 307 cu in (5.0 L), 327 cu in (5.4 L), and 350 cu in (5.7 L) Chevrolet smallblocks, and later253 cu in (4.1 L) and 308 cu in (5.0 L) Holden V8. This was followed by the release of four high-performance Toranas, the LC GTR-XU1 (1970–1971), LJ GTR-XU1 (1972–1973), L34 (1974), and the A9X (1977).

The LC XU1 Torana was fitted with a 186 cu in (3.0 L) triple carbureted 6-cylinder engine, later increased with the release of the LJ model to 202 cu in (3.3 L), as opposed to the 308 cu in (5.0 L) single q­-barrel carbureted V8 in the SL/R 5000 L34, and SLR5000/SS A9X. There were many homologation changes over the four or so years of XU-1 production culminating in a special "Bathurst 1973" specification LJ XU-1.

The L34 was primarily an engine option on the lesser specification LH SL/R 5000 sedan; a factory HO pack providing an upgraded camshaft, Holley carb, and other race ready items was also available. The basic L34 also gained other homologation features such as improved brakes and wheel arch flares. The A9X was an option on the LX SLR5000 sedan and the LX SS hatchback (2-door) and unlike the L34 package was not an engine performance upgrade but a suspension, differential, and brake upgrade, as the L34 engine was already homologated for Group C use. Hence, the A9X had a basically standard 308ci engine.

Chrysler produced the R/T Valiant Charger from 1971 to 1973, when the R/Ts were discontinued; the dominant R/T models were the E38 and E49 with high-performance 265 cu in (4.3 L) Hemi engines featuring triple Weber carburetors.

Chrysler apparently considered a high-performance V8 program importing 338 340 cu in (5.6 L) V8 engines from the U.S. This high-performance project never went ahead, and the engines were subsequently fitted to the upmarket 770 model Charger. Initially, this model was designated "SE" E55 340 (V8) and only available with automatic transmission; with a model change to the VJ in 1973, the engine became an option, and the performance was lessened. All Chrysler performance Chargers were discontinued in 1974 with the end of high-performance, the 265 Hemi, and 340 V8 engines.

The Australian muscle car era is considered to have ended with the release of the Australian Design Rule regarding emissions in ADR27a in 1976. An exception to this rule was the small number of factory-built Bathurst 1000 homologation specials that were constructed after 1976; these are considered to be muscle cars. Examples of these homologation specials include the Torana A9X and the Bathurst Cobras.

Later homologation cars were built outside of the factory, many by the Holden Dealer Team (HDT) for track and road use. Although not regarded as true muscle cars, they quickly gained an enthusiastic following. The HDT program was under Peter Brock's direction and had approval from Holden.

Several highly modified high-performance road-going Commodores were produced through the early and mid 1980s. These "homologation specials" were produced to meet the Group A racing regulations. Models included the VC Group C, the VH SS Group III with a 0–100 km/h of 6.7 seconds, the Blue VK SS Group A, and the burgundy VL SS Group A. The vehicles are all individually numbered with only 4246 Brock HDT's made and are considered to be collectors' items.

The HDT Commodores are highly collectible muscle cars. Holden Dealer Team vehicles became more collectible following the death of Peter Brock, the team's principal, in 2006. Showroom-condition HDT cars are generating prices as high as $200,000 AU.