Davis, who was Progressive Conservative premier of Ontario from 1971 to 1985, introduced Harper to a crowd of more than 800 at a rally in Burlington, Ont.
The Conservatives are hoping to grab some seats in the Greater Toronto Area from the Liberals, and the mood of the crowd was such that Davis felt comfortable making a lighthearted pitch for a cabinet post.
"The only thing I would say, Stephen if you're at the back of the room hiding there somewhere, I am available," Davis said.
Conservative Leader Stephen Harper.
The riding of Burlington has been held by a Liberal since 1993. Harper said on Tuesday he believes that will change next Monday.
"We are going to be painting the western part of the GTA an even brighter blue than it's seen since the days of Bill Davis's big blue machine," Harper said.
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Harper spoke of Davis's legacy, including an acid rain treaty with the United States, and vowed his own government would pass legislation to clean up the air, land and water.
Harper also focused on how he would cut taxes and control government spending.
After another rally in downtown Toronto on Wednesday, Harper flies off to Quebec for a third time this week, to shore up his growing support in that province.
Liberal Leader Paul Martin is in Southwestern Ontario on Wednesday.
NDP Leader Jack Layton is in Quebec City.
