THE NASCAR X-FINITY SERIES … also competes in “Thunder Valley” with tonight’s Food City 300.  Daniel Suarez set the pace in Thursday’s opening practice and the second session was rained out … There was news off the track as Hendrick Motorsports announced that it has signed Camping World Truck Series points leader William Byron to a multi-year agreement.  He’ll race full-time in the 2017 X-FINITY Series for Hendrick affiliate Junior Motorsports.  Byron is now competing for Kyle Busch Motorsports and leads the Truck Series with five wins heading into the final ten races of the season.