The NASCAR K&N Pro Series (formerly the NASCAR Camping World West Series, NASCAR Winston West Series, NASCAR Grand National Division, AutoZone West Series, and the NASCAR West Series) is a division of NASCAR that was formed in 1954 is made up of two regional tours, the East and the West. The East region has events along the Atlantic coast, while the West races along the Pacific coast and in several western states. Both regions run a difficult combination of tracks including; short tracks intermediates, road courses, and speedways.

NASCAR K&N Pro Series cars weigh 3,250 or 3,300 pounds, power is provided by a 358 cubic-inch engine. The wheelbases of the cars are 105 or 110 inches, and drive on Goodyear tires.

The 2010 season of the K&N Pro Series has kept Portland International Raceway to the venue list.

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