Yield guidance tightened steadily over the course of the day to a 6.25-6.375 percent range after initial talk in the 6.5 percent area.

"I understand the final price should come in around 6.25 percent, the existing bonds are also doing very well," one fund manager in London said.

A source close to the deal told Reuters that pricing could be subject to change as books are still open in New York.