Bathurst will begin 30 minutes earlier than originally slated this Sunday in a decision made by Supercars amid concerns over the weather at Mount Panorama.
The race was originally supposed to begin at 11.30am but will now begin at 11am with the current weather forecast predicting rain and scattered thunderstorms during the time cars are expected to be out on track.
The reason for this is that Supercars fear that weather-enforced stoppages could result in their flagship race being red-flagged.
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There is also a threat of rain Friday and Saturday, although current projections are that Mount Panorama is likely to remain dry until the early hours of Sunday.
The Bureau of Meteorology is forecasting up to 10mm of rain.
The 1000km race usually takes around six hours to complete, but prolonged weather stoppages could see the race plunged into darkness and potentially even abandoned in failing light due to safety concerns.
A minimum of 81 laps needs to be completed for a champion to be crowned.