Independent office corrects NSW Libs over WestInvest

Dominic Perrottet campaigning in Penrith where the Liberals are trying to hang on with Stuart Ayres. (Nikki Short/AAP PHOTOS) (AAP)

Sparks have flown in the final hours of the NSW election campaign over potential changes to a $5 billion infrastructure fund serving key marginal electorates in western Sydney.

Both parties locked horns on Friday over whose plan was best for the billions of dollars remaining in the WestInvest fund, from the sale of the WestConnex toll road.