Portland International Raceway, Portland, ORAugust 31–September 1, 2013 Richard Duncan, driving the 1966 Bill Leonheart Special, dominated the large-bore sportscar group during the weekend.Photo: Jeff Mach Joe Liesback’s 1970 Titan Mk 5 Formula Ford in Turn 3.Photo: Jeff Mach Dennis Daugs’ ’69 Alfa Romeo GTV leads Jack Healy’s 1969 BMW 2002 through Turn 6.Photo: Jeff Mach Al Moore in his 1965 Crusader Sportsracer.Photo: Jeff Mach