The 40-year-old Allmendinger from Los Gatos, California, led a race-high 25 of 72 over-scheduled laps and prevailed through two overtime attempts to claim his fourth consecutive Xfinity victory at the Roval.
In the wake of B.J. McLeod driving for Spire Motorsports in place of James Davison, Garrett Smithley will drive for B.J. McLeod Motorsports at Talladega on June 21.
