The NASCAR Cup Series cars will have a new rules package this weekend at Talladega Superspeedway aimed at improving the overall safety of the vehicles. These rules changes were implemented in a May 1 technical bulletin and include lessons learned from the investigation into the No. 6 car incident at Daytona.
The changes are as follows:
- Addition of a lower main roll bar support bar #20 / intrusion plate and upper main roll bar support bar #21 (mandatory superspeedways, optional elsewhere).
- Elimination of aero ducts at superspeedway tracks.
- Reduction in size of throttle body from 59/64” to 57/64” (superspeedways only).
- Updated roll bar padding specifications (mandatory at all tracks beginning June 1).
- Oil reservoir tank or overflow expansion tank must contain a check valve (mandatory at all tracks beginning with Talladega).
- Slip tape must be applied along the entire length of the lower rearward facing surfaces of the rear bumper cover and extension (superspeedways only).