2006 Chevy Cobalt compression in psi

For some reason, my data source isn't showing the specs on your engine. Maybe another technician on this site will have the information.

However, the purpose of a compression check is to see if all cylinders are equal. (So long as you perform the procedure correctly) Knowing the manufacture's specs isn't really necessary.

Also, knowing how to interpret your readings is important. If you have a single cylinder down on compression, then you need to know what to do next. (Isolate the cause of the loss of compression)
Drop a little oil into that cylinder and retest. If compression builds, then that was your rings leaking compression. If it's still low, then that's your valves leaking or a hole in your piston. (Sometimes your head gasket can be partially blown around a single cylinder and leaking into the coolant system)

If you have two adjacent cylinders down on compression, then that would be a blown head gasket.