TREGEAR Reserve and The Ponds have been earmarked as possible sites for mega-parks.
Blacktown mayor Len Robinson wants to create one or two in each of the five wards using the sale proceeds from 30 listed parks under 0.125 hectares.
They would be similar to the new one at Blacktown Showground.
A motion was moved at last week's council meeting that a report be prepared outlining the way building new mega-parks can be expedited and funded.
It was rejected by Labor councillors — in the majority with three Liberals absent.
"The former Labor council didn't need to sell even one park to pay for the $16 million mega-park at Blacktown Showground," Councillor Stephen Bali said.
The matter returns to the council in a fortnight's time as a rescission motion by the Liberals.
Mayor Robinson has inspected mega-park sites with council staff and is considering one at Tregear Reserve as one of the first. They wouldn't be possible without selling off small parks, he said. "The Labor council left us with a $50 million black hole."
Fellow Liberal, Cr Jackie Donaldson said families travel outside the area to places such as Western Sydney Parklands in Abbotsbury. "Some parks around here have three pieces of equipment," she said.
The small parks listed for sale will have signs stating they will be rezoned from open space. Liberal councillors said none of Blacktown's other 122 parks are threatened.