THE 'NASCAR XFINITY RACING SERIES' MAKES ITS FIRST APPEARANCE IN THE ROSE CITY THIS WEEKEND AT PORTLAND INTERNATIONAL RACEWAY. THE NASCAR TRUCK SERIES LAST RACED AT P-I-R IN 1999 AND 2000. TODAY IS PRACTICE SESSIONS FOR THE XFINITY AND (ark-kuh muh-nards) ARCA MENARD'S SERIES, AND SATURDAY IS THE XFINITY 'PACIFIC OFFICE AUTOMATION-147' FEATURED RACE WITH THE GREEN FLAG WAVING AT 130 TELEVISED ON FOX SPORTS-1. THE INDY CAR SERIES 'GRAND PRIX OF PORTLAND' COMES TO OREGON IN EARLY SEPTEMBER.