NASCAR issued updates to its rulebook Friday night for all three national series.Among the highlights is a change in restrictor plate hole size for superspeedway (Daytona and Talladega) events; roof hatch requirements for superspeedway races; toe board energy material requirements; and for just the Cup Series, a change in spoiler...

NASCAR released the 2017 Sprint Cup rules package on Friday, highlighted by measures to reduce downforce and improve safety."The objective there is to give the drivers, put the driving back in their hands a bit more ... take less aero dependence off the car," Gene Stefanyshyn, NASCAR senior vice president...