The Holden Monaro 427C - Australia's Homegrown GT Monster

The Australian automotive industry is an oddity in the global scheme of things. A small buying population, the most brands per head of population, and innovations not seen elsewhere, make it virtually unique.

Although we weren’t the first to build a car with a hardtop and two doors, we certainly made some great ones. Ford, Chrysler, Mitsubishi, and Holden all have cars that are memorable and one that stands out was the Monaro 427C. 

Designed, engineered, and built in Australia, this car was intended to be a track weapon and race in the Bathurst 24 Hour. The first of these races was set to run in late 2002, meaning the development of the car, slated to run in 2003, had to be brought forward. 

The heartbeat of the 427C was its US sourced 7.0L or 427cid V8. With the Holden Racing Team turning down the offer of developing the machine, Garry Rogers Motorsport (GRM) took the Chevrolet Corvette C5-R engine, a Monaro body, and the responsibility of running the 427C as a race car. 

The car would later be a controversial one; the race would attract cars from outside Australia such as Lamborghini’s Diablo GTR, Ferrari’s 360 N-GT, and the monstrous Chrysler Viper ACR. All of these cars would race with the same engine they would come off the production line with. However, the Monaro at the time came with Chev’s fabled 350cid or 5.7L V8, and therefore would be ineligible to run. However, the organiser of the race, which would come under the umbrella of a racing group called Procar, allowed the Monaro to be run with the bigger engine to be seen as more competitive with capacities such as the 8.0L V10 in the Viper.

As the race was going to be run under the then current GT regulations, GRM had to design a body kit to suit both the regulations and the aerodynamics of the VX Commodore based two door. Using the V8 Supercars design as a basis, GRM fitted a wider rear wing that sat below the car’s roofline, as per the regulations. A similar front air dam was fitted to the front, and underneath the 427C utilized a number of components that could be found on a Supercar. 

A technically minded casual observer would see a Hollinger six speed manual transmission, wheels of 18 x 11 and 18 x 13 inches, MacPherson strut front suspension and a trailing arm rear, bolted to coil springs and thick anti-roll bars. The engine was said to be good for 600 ponies (447kW) and would be bolted into the front of a car weighing 1,400 kilograms. 

All up the Monaro 427C would be 4789mm in length, run a front and rear track of 1559mm/1577mm, and roll on a wheelbase of 2788mm. The aero package provided plenty of down-force and made for a stable on track racer. 

Raced at the 2002 Bathurst 24 Hour by a team of four drivers, being Garth Tander, Nathan Pretty, Steven Richards, and Cameron McConville, the car was also being touted as being available as a road car. The race car itself would prove to be strong, durable, and a race winner. Although despite suffering a flat tyre and a collision with another car, the car would ultimately win in its debut race by 24 laps.

As a road car, it was potentially to be powered by a 433kW version of the 427cid engine. But, as a business case, the numbers simply didn’t add up and would result in a mooted buy price of $215,000 being out of reach of its intended market. Just two road going cars, and just four race cars, would be built.

The Monaro 427C would go on to compete in the Australian Nations Cup Championship in 2003, and the Bathurst 24 Hour race in the same year. A second race car had been built by then. Driven by Peter Brock, Jason Bright, Todd Kelly, and Greg Murphy, the car would win by just 0.3035 of a second. Tander, driving the 2002 winning vehicle, was thwarted in a last sector charge by a yellow flag thanks to a car close to the racing line.

The 427C would race in 2004 and see a third chassis completed, before the Nations Cup category collapsed due to fiscal issues. With regulations reverting to GT Championship rules in 2005, the Monaro 427C was deemed ineligible. Of the race cars, one is with a private collector, one is in the Bathurst Motor Museum, and little if anything is known of the locations of the others.