A one-of-one prototype that previewed a new era for Holden Special Vehicles – one that would never come to fruition – is once again for sale.

Young Timers Garage (YTG) has listed the one-off 2019 HSV Colorado SportsCat V8 prototype for a cool $299,000 before on-road costs.

Its creator, Walkinshaw Automotive, put it up for auction in 2021, when it went for $205,000 before the 7.5 per cent buyer’s fee.

While HSV did sell a SportsCat version of the Thai-built Holden Colorado dual-cab 4×4 ute, it came with an unchanged 2.8-litre turbo-diesel four-cylinder engine.

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The Colorado SportsCat V8, in contrast, features General Motors’ naturally aspirated 6.2-litre ‘LT1’ petrol V8, mated with a 10-speed automatic transmission. YTG claims it produces outputs of 350kW of power and 650Nm of torque, and can do the 0-100km/h dash in under five seconds.

This engine was used in the sixth-generation Chevrolet Camaro, which Walkinshaw converted to right-hand drive for the Australian market.

To accommodate the V8 engine, the Colorado received a new airbox, engine mounts, fuel system, ECU and wiring loom, while the hot ute also received new front and rear prop shafts and a new 4×4 transfer case said to come from the larger Silverado pickup also converted by Walkinshaw.

The prototype in 2021
The prototype in 2021