Australia’s “petrolhead” culture is as healthy as it is here in the US, and so is the trend of putting modern LS power between the fenders of classic cars. Case in point – this video from FullBOOST, featuring Steven Loader’s Holden HG with a twin turbo LS1 swap.

Produced for the 1970 and 71 model years, the HG platform came in a wide variety of trim levels (we’re no experts, but this looks like a Premiere to us, based on the quad headlights and grille badge – Aussie fans please correct us in the comments if we’re wrong) with engines ranging from a 161 cubic inch inline-6 up to the ubiquitous 350 cube small block V8. Loader’s HG has received a stock-internals LS1 swap, boosted by a pair of Turbonetics turbochargers and fed E85.

In the video, we see the car undergoing an initial tune on the rollers at MPW Performance, a Melbourne-based LS engine specialist. With boost set to a maximum of 7 PSI, the initial pull nets 301kW (that’s a bit over 403 horsepower for those who aren’t down with SI units), then we see 332, 342, and finally 345kW readings, for the equivalent of 462 ponies to the pavement.

While that might not sound like a lot for a twin-turbo setup, keep in mind that this super-clean build was planned with bigger boost in mind – crank down those wastegates and Loader will be finding the limits of the stock LS1 pretty quickly. In any case, the surgical-suite tidiness of the Holden’s engine bay looks awesome as-is, and we’d be completely happy with this immaculate HG as a daily driver (once we got used to having the steering wheel on the wrong side, of course…)