What is correct tire pressure for 2005 Chevy classic?

It will be written in small print on the side of the tire. It will also be written on a label in one of the door jambs. Go with the label.

The pressure written on the side of the tire is the maximum tire pressure the tire will safely hold and is not the pressure you should inflate the tires to. The correct pressure is written on the driver's door post as stated above.