Suggest you pick up a copy of your local tracks sanctioning body rule book. It will have all of the information about the various classes.
If your local track is a NHRA-sanctioned track, you can either join NHRA and get the complete rule book from Top Fuel/Funny Car on down to stock, or your can purchase a NHRA rulebook from their website: https://store.nhra.com/product.asp?3=273