[Chevy454]

The "Certified Stock" tech is something new they added this year, to try and quiet a few rumblings about some cars. It involves a thorough inspection of the car, and an engine tear down, and then the engine components are checked. All cars, certified stock or not, all run against each other and are matched up by ETs. So, there really aren't different "classes" so to speak, just some cars are going through a tear down.

Which tires are you running...Firestone or Goodyear? Also, what tire pressure?