@edp17

You can change the kernel string in the defconfig file. CONFIG_LOCALVERSION is what you are looking for. For example:
CONFIG_LOCALVERSION="-cyanogenmod-g0aac178"
You need to disable CONFIG_LOCALVERSION_AUTO to make these changes work.

And you need to change lines 86 and 87 in META-INF/com/google/android/update-binary to match the new localversion.