It refers to DCR which is dynamic compression ratio. It is a computation of what you might think of as the 'effective' compression ratio of an engine with the cam's effects taken into account.
You want that number high to boost low RPM torque (below roughly 3000 RPM, where the exhaust scavenging effect dies off) but not too high, because too high means you will run into detonation problems and that is bad juju.
BTW, there are better cam profiles out there IMHO for this engine if you are open to suggestions. Not better because they are bigger in duration or lift , but better in the fact that they get the valve open more quickly and can get more charge into the cylinders. The contemplated cam change is not very much. Are you using the stock rocker package?
