Team Penske's eight-year IndyCar winless skid at Iowa Speedway is hard to figure out.

This might be the year that one of the circuit's powerhouse programs finally knocks a win at Iowa off its to-do list.

Penske will enter Saturday's race with three of the top five drivers in IndyCar, including series leader Juan Pablo Montoya.

And all of those drivers will be powered by Chevrolet engines and aero kits, which have proven to have quite the advantage over their Honda counterparts this season.